2017 is the year ℃-ute disbands, Tsugunaga Momoko graduates from Country Girls and Hello! Project, Country Girls becomes a semi-active group with members moved to other Hello! Project groups for main activities, Fujii Rio is fired from Kobushi Factory and Hello! Project, Ogawa Rena graduates from Kobushi Factory and Hello! Project, Inaba Manaka returns to activities within Hello! Project, and Kudo Haruka graduates from Morning Musume '17 and Hello! Project.
Members
- January 1:
- Morning Musume '16 becomes Morning Musume '17.
- Wada Ayaka becomes leader of Hello! Project.
- Fukumura Mizuki becomes sub-leader of Hello! Project.
- March 6: Shimakura Rika, Hibi Marina, Eguchi Saya, Doi Rena, Okamura Minami, Matsunaga Riai, Yamada Ichigo, and Nakayama Natsume join Hello Pro Kenshuusei.
- March 15: Kamiishinaka Kana is formed.
- May 22: Buono! disbands.
- June 12: ℃-ute disbands.
- June 26:
- Danbara Ruru and Yanagawa Nanami join Juice=Juice.
- Morito Chisaki joins Morning Musume '17.
- Funaki Musubu and Kawamura Ayano join ANGERME.
- June 30: Tsugunaga Momoko graduates from Country Girls and Hello! Project.
- July 6: Fujii Rio leaves Kobushi Factory and Hello! Project.
- September 6: Ogawa Rena graduates from Kobushi Factory and Hello! Project.
- December 11: Kudo Haruka graduates from Morning Musume '17 and Hello! Project.
Singles
- February 4: Real☆Little☆Girl / Kanojo ni Naritai!!! (Hello Pro Kenshuusei Hokkaido Ver.) - Hello Pro Kenshuusei Hokkaido (pre-sale; limited release)
- February 8: Good Boy Bad Girl / Peanut Butter Jelly Love - Country Girls
- February 22: Hatsukoi Sunrise / Just Try! / Uruwashi no Camellia - Tsubaki Factory
- March 8: BRAND NEW MORNING / Jealousy Jealousy - Morning Musume '17
- March 25: Furusato no Yume - Kamiishinaka Kana
- March 29: To Tomorrow / Final Squall / The Curtain Rises - ℃-ute
- April 26: Jidanda Dance / Feel! Kanjiru yo - Juice=Juice
- May 9: UPPER DISCO / FOREVER YOUNG - Up Up Girls (Kari)
- June 14: Shalala! Yareru Hazu sa / Ee ja nai ka Ninja nai ka - Kobushi Factory
- June 21: Ai Sae Areba Nanni mo Iranai / Namida Iro no Ketsui / Majokko Megu-chan- ANGERME
- July 5: Real☆Little☆Girl / Kanojo ni Naritai!!! (Hello Pro Kenshuusei Hokkaido Ver.) - Hello Pro Kenshuusei Hokkaido (general release)
- July 26: Shuukatsu Sensation / Waratte / Hana Moyou - Tsubaki Factory
- August 23: Fiesta! Fiesta! - Juice=Juice (digital release)
- October 4: Jama Shinai de Here We Go! / Dokyuu no Go Sign / Wakain da shi! - Morning Musume '17
Digital Songs
- May 19:
- June 2: Hello! Massara no Jibun - Hello Pro Kenshuusei
- June 16: Jouro - Juice=Juice
- June 17: ♡Otomomochi Densetsu♡ - Momochi-sensei with Otomomochi no Minna
- June 30:
- Isshakudama de Buppanase! - Hello Pro Kenshuusei
- Inoue no Uta - Inoue Rei (Kobushi Factory), Inoue Hikaru (Hello Pro Kenshuusei)
- July 14: Obaka Neko to Obaka Neko Baka no Uta - Iikubo Haruna (Morning Musume '17), Kanazawa Tomoko (Juice=Juice)
- July 28: Minmin Rock 'n' Roll! - Funaki Musubu (ANGERME / Country Girls), Yokoyama Reina (Morning Musume '17)
- August 11:
- Konamaiki Girl - Country Girls
- Gobaku ~We Can't Go Back~ - Ichioka Reina, Danbara Ruru, Kawamura Ayano, Takase Kurumi, Kiyono Momohime
- September 8: Arigatameiwaku Monogatari - Hello Pro Kenshuusei
Albums
- March 29: Butai "JK Ninja Girls" Original Soundtrack - Kobushi Factory
- May 3: ℃OMPLETE SINGLE COLLECTION - ℃-ute
- June 28: Tsugunaga Momoko Idol 15 Shuunen Kinen Album ♡Arigatou Otomomochi♡ - Tsugunaga Momoko
- July 12: Engeki Joshibu "Pharaoh no Haka" Original Soundtrack - Morning Musume '17
- September 6: Eiga & Butai "JK Ninja Girls" Original Soundtrack - Kobushi Factory
- November 1: Engeki Joshibu "Yumemiru Television" Original Soundtrack - ANGERME
- December 6: ⑮ Thank you, too - Morning Musume '17
- December 13: Petit Best 18 - Hello! Project
DVD/Blu-ray Singles
- January 9: Event V "Sexy Cat no Enzetsu / Mukidashi de Mukiatte / Sou ja nai" - Morning Musume '16 (DVD)
- March 12: Event V "Good Boy Bad Girl / Peanut Butter Jelly Love" - Country Girls (DVD)
- April 1: Event V "Hatsukoi Sunrise / Just Try! / Uruwashi no Camellia" - Tsubaki Factory (DVD)
- May 6: Event V "BRAND NEW MORNING / Jealousy Jealousy" - Morning Musume '17 (DVD)
- May 7:
- May 20: Event V "Jidanda Dance / Feel! Kanjiru yo" - Juice=Juice (DVD)
- August 8: Event V "Shalala! Yareru Hazu sa / Ee ja nai ka Ninja nai ka" - Kobushi Factory (DVD)
- September 3: Event V "Ai Sae Areba Nanni mo Iranai / Namida Iro no Ketsui / Majokko Megu-chan" - ANGERME (DVD)
- September 16: Event V "Shuukatsu Sensation / Waratte / Hana Moyou" - Tsubaki Factory (DVD)
- December 13: Manner Mode / Kisokutadashiku Utsukushiku / Kimi Dake ja nai sa...friends - ANGERME (DVD & Blu-ray)
DVDs/Blu-rays
- January 18:
- ℃-ute Cutie Circuit ~Let's go to Hong Kong & Taipei!~ (DVD)
- The Girls Live Vol.29 (DVD)
- January 25: MODE (DVD)
- February 22:
- March 8: The Girls Live Vol.30 (DVD)
- March 22: ℃-ute Concert Tour 2016 Aki ~℃OMPASS~ (DVD & Blu-ray)
- March 29: Morning Musume '16 Concert Tour Aki ~MY VISION~ (DVD & Blu-ray)
- April 12: Hello! Project COUNTDOWN PARTY 2016 ~GOOD BYE & HELLO!~ (DVD & Blu-ray)
- April 26: Hello! Project 2017 WINTER ~Crystal Clear・Kaleidoscope~ (DVD & Blu-ray)
- May 17:
- The Girls Live Vol.31 (DVD)
- Morning Musume '16 Live Concert in Taipei (DVD)
- Nega Poji Poji (DVD)
- May 24: Country Girls Music Video Clips Vol.1 (Blu-ray)
- June 14: The Girls Live Vol.32 (DVD)
- June 21: Off Momochi in Okinawa - Tsugunaga Momoko (Blu-ray)
- June 28: Chisaki in Paradise - Morito Chisaki (Blu-ray)
- July 12:
- Hello! Project Hina Fest 2017 <℃-ute Premium> (DVD & Blu-ray)
- Hello! Project Hina Fest 2017 <Morning Musume '17 Premium> (DVD & Blu-ray)
- The Girls Live Vol.33 (DVD)
- August 9: Juice=Juice LIVE AROUND 2017 ~NEXT ONE SPECIAL~ (DVD & Blu-ray)
- August 16:
- Country Girls Concert Tour 2017 Haru ~Momochi-ism~ (DVD & Blu-ray)
- The Girls Live Vol.34 (DVD)
- August 23: ANGERME Concert Tour 2017 Haru ~Kawaru Mono Kawaranai Mono~ (DVD & Blu-ray)
- September 6:
- September 13:
- Tsugunaga Momoko Memorial Event Momogatari (DVD)
- Buono! Live 2017 ~Pienezza!~ (DVD & Blu-ray)
- The Girls Live Vol.35 (DVD)
- September 20: Morning Musume '17 Concert Tour Haru ~THE INSPIRATION!~ (DVD & Blu-ray)
- September 27: raindrop - Funaki Musubu (Blu-ray)
- October 4: Pharaoh no Haka (DVD)
- October 11:
- October 25: Tsugunaga Momoko Last Live ♥Arigatou Otomomochi♥ (DVD & Blu-ray)
- November 15:
- Morning Musume '17 Live Concert in Hong Kong (DVD)
- Hello! Project 2017 SUMMER ~HELLO! MEETING・HELLO! GATHERING~ (DVD & Blu-ray)
- The Girls Live Vol.37 (DVD)
- November 22: Do The Vacation - Kudo Haruka (Blu-ray)
- December 27: TBA - Oda Sakura (Blu-ray)
Concerts
- January 2 - February 25: Hello! Project 2017 WINTER
- January 5 - January 9: ℃-ute Shinshun Concert 2017 ~℃OMPASS~
- January 22 - June 3: Naruchika 2017 ℃-ute
- February 2 - April 9: Juice=Juice LIVE AROUND 2017 ~NEXT ONE~
- February 5: Hello Pro Kenshuusei Hokkaido Teiki Kouen Vol.1
- February 5 - February 19: ℃-ute Dinner Show 2017 ~℃ocktail~
- February 8 - March 8: ℃-ute Special Live 2017 ~℃ocktail in ℃OTTON CLUB~
- March 5 - April 1: ANGERME Live Tour 2017 Haru ~Rin~
- March 11 - March 20: Hello! Project Kenshuusei Happyoukai 2017 3gatsu ~Marching!~
- March 18 - August 13: Morning Musume '17 Concert Tour Haru ~THE INSPIRATION!~
- March 22 - April 13: HAPPY DINNER TIME ~Momo ni Sachi Are!~
- March 25 - March 26: Hello! Project Hina Fest 2017
- April 1 - June 4: ℃-ute Concert Tour 2017 Haru ~℃elebration~
- April 9 - May 15: ANGERME Concert Tour 2017 Haru ~Kawaru Mono Kawaranai Mono~
- April 9 - May 20: Country Girls Concert Tour 2017 Haru ~Momochi-ism~
- April 9 - May 28: Kobushi Factory Live Tour 2017 Haru ~PROGRESSIVE~
- April 13: ℃-ute Cutie Circuit ~¡De vuelta a México!~
- April 16: ℃-ute Cutie Circuit ~De retour à Paris~
- April 29 - June 18: Country Girls Live Tour 2017 Haru
- April 29 - May 27: Juice=Juice LIVE AROUND 2017 ~NEXT ONE SPECIAL~
- May 4: Hello Pro Kenshuusei Hokkaido Teiki Kouen Vol.2
- May 5: Hello! Project Kenshuusei Happyoukai 2017 ~Haru no Koukai Jitsuryoku Shindan Test~
- May 22: Buono! Live 2017 ~Pienezza!~
- June 3 - June 10: Hello! Project Kenshuusei Happyoukai 2017 6gatsu ~June Tripper!~
- June 11: ℃-ute Dinner Show 2017 ~Iwai! ℃-ute Kessei 12 Shuunen!!!!!~
- June 12: ℃-ute Last Concert in Saitama Super Arena ~Thank you team℃-ute~
- June 25: Morning Musume '17 Live Concert in Hong Kong
- June 30: Tsugunaga Momoko Last Live ♥Arigatou Otomomochi♥
- July 13 - September 11: Juice=Juice LIVE AROUND 2017 ~Seven Horizon~
- July 15 - September 2: Hello! Project 2017 SUMMER
- July 17: Hello Pro Kenshuusei Hokkaido Teiki Kouen Vol.3
- August 2: OTODAMA SEA STUDIO 2017 Natsu da! Umi da! ANGERME da!!
- August 15 - August 17: Naruchika Morning Musume '17
- August 22: OTODAMA SEA STUDIO 2017 ~SUMMER FACTORY~
- September 3 - September 10: Hello! Project Kenshuusei Happyoukai 2017 9gatsu ~Go NEXT!~
- September 8 - December 17: Juice=Juice LIVE AROUND 2017 ~World Tour~
- September 10 - December 10: ANGERME Live Tour 2017 Aki "Black & White"
- September 12: NTT docomo presents ANGERME VS Up Up Girls (Kari) ~THANK YOU! DEAR MY FRIENDS~
- September 18: Hello Pro Kenshuusei Hokkaido Teiki Kouen Vol.4
- September 23 - December 3: Morning Musume Tanjou 20 Shuunen Kinen Concert Tour 2017 Aki ~We are MORNING MUSUME~
- October 6 - October 10: Juice=Juice LIVE AROUND 2017 ~World Tour→J=J Day Special~
- October 7 - December 3: Kobushi Factory Live Tour 2017 Aki ~Songs For You~
- October 22 - November 12: Juice=Juice LIVE AROUND 2017 ~Beyond the Beyond~
- November 11: ANGERME Concert 2017 Autumn "Black & White" special ~Fuurinkazan~
- November 20: Juice=Juice LIVE AROUND 2017 FINAL at Nippon Budokan ~Seven Squeeze!~
- November 23: Hello Pro Kenshuusei Hokkaido Teiki Kouen Vol.5
- December 2 - December 10: Hello! Project Kenshuusei Happyoukai 2017 12gatsu
- December 11: Morning Musume Tanjou 20 Shuunen Kinen Concert Tour 2017 Aki ~We are MORNING MUSUME~ Kudo Haruka Sotsugyou Special
- December 31: Hello! Project 20th Anniversary!! Hello! Project COUNTDOWN PARTY 2017 ~GOOD BYE & HELLO!~
Events
- January 26 - January 27: Morning Days Happy Holiday Fukumura Mizuki・Ishida Ayumi Fanclub Tour in Yamanashi
- January 29 - February 5: Tsubaki Factory Ouen Kikaku ~Camellia Fights! vol.5~
- February 21: Morning Musume '17 13ki Member FC Event
- March 11 - March 12: Juice=Juice Fanclub Tour ~Miracle×Juice×Bus 2~ in Izu
- March 25 - March 26: Asobu. Kurasu. Sodateru. SATOYAMA & SATOUMI e Ikou 2017
- April 18 - April 20: Tsugunaga Momoko Memorial Event Momogatari
- May 18: ℃-ute Okai Chisato・Hagiwara Mai FC Event 2017
- May 28 - May 30: Cutie Kankousha Fanclub Tour in Okinawa ~FINAL "Cutie" VA℃ATION~
- June 2 - June 4: Momochi to Iku Otomomochi Tour ~Minna Zutto Otomomochi da yo~
- September 1: Kobushi Factory FC Event 2017
- September 14: Morning Musume Kessei 20 Shuunen Kinen Event ~21 Nenme mo Ganbatte Ikimasshoi!~
- October 9: Asobu. Fureau. Taiken Suru. SATOYAMA & SATOUMI Aki Camp in Odawara
- November 6: Country Girls 3 Shuunen Kinen Event ~Minna Genki Shiteta?~
- November 8 - November 9: Morning Days Happy Holiday 10ki Member Iikubo Haruna・Ishida Ayumi・Sato Masaki・Kudo Haruka Fanclub Tour in Yamanashi
- December 5: Yamaki Risa to Tanoshimu! Real Dasshutsu Game
- December 9: Morning Musume '17 Kudo Haruka Solo Event
- December 9 - December 10: SATOYAMA Tour Dai 5 Dan! Kobushi Factory to Sugosu 1paku 2nichi Bus Tour in Gunma
- December 16: Kobushi Factory Christmas FC Event 2017 ~Smile For You~
- December 17: ANGERME Christmas FC Event 2017 ~Kakko Kari~
- December 23: Tsubaki Factory FC Event ~Camellia Fights! vol.6 Mini Mini☆Christmas-kai 3~
- December 24: Morning Musume '17 Christmas FC Event ~Premoni 2~
Birthday Events
- January 12: Country Girls Yanagawa Nanami Birthday Event 2017
- January 13: Morning Musume '17 Ishida Ayumi Birthday Event
- February 2: Morning Musume '17 Makino Maria Birthday Event
- February 6: ℃-ute Nakajima Saki Birthday Event 2017
- February 7: ℃-ute Yajima Maimi & Hagiwara Mai Birthday Event 2017
- February 10: Kobushi Factory Nomura Minami Birthday Event 2017
- February 13: Country Girls Ozeki Mai Birthday Event 2017
- February 15: Morning Musume '17 Ogata Haruna Birthday Event
- February 20: Country Girls Morito Chisaki Birthday Event 2017
- March 6: Momochi no Otanjoubi Kai 2017
- March 7: Kobushi Factory Fujii Rio Birthday Event 2017
- March 9: Kobushi Factory Wada Sakurako Birthday Event 2017
- March 27: Kobushi Factory Ogawa Rena Birthday Event 2017
- March 28: Morning Musume '17 Haga Akane Birthday Event
- March 29: Morning Musume '17 Oda Sakura Birthday Event ~Sakura no Shirabe 6~
- April 2: Juice=Juice Miyazaki Yuka Birthday Event 2017
- April 3: Tsubaki Factory Kishimoto Yumeno Birthday Event 2017
- April 6: ANGERME Katsuta Rina Birthday Event 2017
- April 21: Juice=Juice Takagi Sayuki Birthday Event 2017
- April 24: ℃-ute Suzuki Airi Birthday Event 2017
- April 27: Kobushi Factory Hamaura Ayano Birthday Event 2017
- May 8: Morning Musume '17 Sato Masaki Birthday Event
- May 23: Country Girls Funaki Musubu Birthday Event 2017
- May 29: ANGERME Sasaki Rikako Birthday Event 2017
- June 5: ANGERME Nakanishi Kana Birthday Event 2017
- June 13: ANGERME Murota Mizuki Birthday Event 2017
- July 2: Juice=Juice Kanazawa Tomoko Birthday Event 2017
- July 21: Morning Musume '17 Ikuta Erina Birthday Event
- July 31: Tsubaki Factory Akiyama Mao Birthday Event 2017
- August 1: ANGERME Wada Ayaka Birthday Event 2017
- August 7: Kobushi Factory Inoue Rei Birthday Event 2017
- August 10: Kobushi Factory Taguchi Natsumi Birthday Event 2017
- August 15: Kobushi Factory Hirose Ayaka Birthday Event 2017
- September 4: Tsubaki Factory Asakura Kiki Birthday Event 2017
- September 29: Tsubaki Factory Ono Mizuho Birthday Event 2017
- October 16: Country Girls Yamaki Risa Birthday Event 2017
- October 19: Morning Musume '17 Nonaka Miki Birthday Event
- October 20: Tsubaki Factory Niinuma Kisora Birthday Event 2017
- October 23: ANGERME Kasahara Momona Birthday Event 2017
- October 24: ANGERME Kamikokuryo Moe Birthday Event 2017
- October 27: Morning Musume '17 Kudo Haruka Birthday Event
- October 30: Morning Musume '17 Fukumura Mizuki Birthday Event
- November 6: Tsubaki Factory Ogata Risa Birthday Event 2017
- November 7: Morning Musume '17 Iikubo Haruna Birthday Event
- November 16: Tsubaki Factory Tanimoto Ami Birthday Event 2017
- November 22: ANGERME Takeuchi Akari Birthday Event 2017
- November 24: Tsubaki Factory Yamagishi Riko Birthday Event 2017
- November 30: Morning Musume '17 Kaga Kaede Birthday Event
- December 1: Juice=Juice Miyamoto Karin Birthday Event 2017
- December 7: Juice=Juice Uemura Akari Birthday Event 2017
- December 18: Tsubaki Factory Onoda Saori Birthday Event 2017
Theater
- February 23 - March 4: JK Ninja Girls
- June 2 - June 11: Pharaoh no Haka
- October 5 - October 15: Yumemiru Television
- October 26 - November 12: Bokutachi Karen na Shounen Gasshoudan
- November 27 - December 3: Ichimai no Ticket ~Beatles ga Yattekuru!~
Auditions
- July 15: Hello! Project Shin Member Audition announced and begins.
Media
- January 22: Furusato no Yume begins.
- June 14: Yajima no Heya becomes Fukumura no Heya. (Podcast)
- July 17: JK Ninja Girls theatrical release.
Publications
Morito Chisaki's first solo photobook Morito Chisaki
- January 1: Hello Pro Maruwakari BOOK 2017 WINTER
- January 28: Haruiro - Iikubo Haruna
- February 19: Morito Chisaki - Morito Chisaki
- March 6: Momochi - Tsugunaga Momoko
- March 31: Eien - Suzuki Airi
- April 27: Riko - Yamagishi Riko
- May 1: ℃-ute Last Official Book
- May 15: MURO - Murota Mizuki
- May 18: Hello Pro Specia~l
- May 20: Buono! Festa 2016 LIVE Mini Shashinshuu
- May 23: Airi Mania - Suzuki Airi
- June 30: Tsugunaga Momoko Sotsugyou Album - Tsugunaga Momoko
- July 15:
- July 17: Eiga "JK Ninja Girls" Official Photobook - Kobushi Factory
- August 7: MUSUBU - Funaki Musubu
- August 30: Senkou Hanabi - Makino Maria
- September 10: Brilliant - Hikari Kagayaku - ℃-ute
- October 27: Kudo Haruka - Kudo Haruka
- November 11: Rei - Inoue Rei
- November 17: TBA - Oda Sakura
Anniversaries
- January 2: Kobushi Factory's 2nd anniversary
- February 3: Juice=Juice's 4th anniversary
- April 4: ANGERME's 8th anniversary
- April 29: Tsubaki Factory's 2nd anniversary
- June 11: ℃-ute's 12th anniversary
- September 14: Morning Musume's 20th anniversary
- October 10: Juice=Juice Day (JuuJuu no Hi)
- November 5: Country Girls' 3rd anniversary