- Hirose Ayaka (廣瀬彩海, leader) (Turquoise)
- Nomura Minami (野村みな美) (Royal Blue)
- Hamaura Ayano (浜浦彩乃) (Pink)
- Wada Sakurako (和田桜子) (Green)
- Inoue Rei (井上玲音) (Purple)
- Fujii Rio (藤井梨央, left July 6, 2017) (Mustard)
- Ogawa Rena (小川麗奈, left September 6, 2017) (Red)
- Taguchi Natsumi (田口夏実, left December 6, 2017) (Orange)
Kobushi Factory was formed on January 2, 2015 at the Hello! Project 2015 WINTER ~DANCE MODE!~ concert where it was announced that their group name would be declared later in January and an indie single would be released in March. The member lineup was revealed to consist entirely of trainees from Hello! Pro Kenshuusei; Fujii Rio, Hirose Ayaka, Nomura Minami, Ogawa Rena, Hamaura Ayano, Taguchi Natsumi, and Inoue Rei.
The announcement of the group name was delayed until February 25, 2015 when it was revealed to be Kobushi Factory. The group's name embodies several meanings; the elegance of the Japanese kobushi magnolia blossom, which itself signifies welcome, friendship, and trust in floriography, and the strength symbolized by a clenched fist (握りこぶし; nigirikobushi). "Factory" represents the inheriting of the spirit of senior group Berryz Kobo as they go on indefinite hiatus, and the members wish to become a close, long-lasting unit just like them. At the time of the announcement it was also disclosed that Berryz Kobo member and Captain, Shimizu Saki, participated in the choosing of the name as her first official task acting in her role as Hello! Project Advisor.
The group's first indie single was simultaneously advertised with the name, to be released and sold as a venue only exlusive during the "Week End Survivor" stage play in which each member was to participate, beginning in March 2015.
At the March 8, 2015 "Hello! Pro Kenshuusei Happyoukai 2015 ~March no Nama Tamago Show!~" concert it was announced that Hirose Ayaka and Fujii Rio would be the respective leader and sub-leader of Kobushi Factory. Three months later on June 2, 2015 at the "Hello! Pro Kenshuusei Happyoukai 2015 ~June no Nama Tamago Show!~" concert the group's major debut single was revealed in a surprise announcement, to be released in autumn 2015.
On May 12, 2017 sub-leader Fujii Rio announced her graduation from both Kobushi Factory and Hello! Project, to take place during the Hello! Project 2017 SUMMER concert tour, citing her goal of devoting herself to her studies in order to become a teacher or a nurse. The exact date of her graduation was later revealed to be the tour finale on September 2, 2017; also the date of Kobushi Factory's major debut. However, it was revealed that Fujii Rio was dismissed from the group early on July 6, 2017 after an official notice was posted to the Hello! Project website announcing the termination of her contract due to discovery of a breach in rules and a failure to comply, the company noting the decision was made after discussions with her family.
An announcement was published to the official website on July 13, 2017 stating that Kobushi Factory member Ogawa Rena would be on hiatus from all activities until mid-August due to health concerns regarding anxiety. Though on September 6th, it was announced that she had decided to graduate from the group and Hello! Project after consulting with her doctors and her condition showing little improvement. She noted her desire to not be a burden on her group, and stated her hopes that fans would remember her and welcome her into becoming a fan herself.
Another sudden announcement was released through the official website on December 6, 2017, alerting to the termination of Taguchi Natsumi's contract and her removal from Kobushi Factory. The announcement stated that the decision was made after discussions with herself and her family regarding her behavior over the course of several months beforehand. The announcement included a message from Hirose Ayaka, the leader of the group, wherein she expressed her disappointment and frustration with the situation and stated that as the leader she felt responsible for the trouble with several members over the previous few months. Her letter also noted that the remaining five members would continue to reach for their goals, and with this new start would deepen their friendship and trust in one another.
Kobushi Factory's second studio album, titled Kobushi Dai Ni Maku, was announced on July 31, 2019 through episode #300 of the Hello! Station webshow, with a release date of October 2, 2019.
The disbandment of the group was suddenly announced on January 8, 2020 through the official website. The announcement stated that Hirose Ayaka had been in talks about her graduation since early 2019, and after lengthy discussions with the rest of the members they together came to the conclusion of disbanding as everyone decided to follow their own chosen path. The final single is to be released on March 4th, with their final live show taking place on March 30th at Tokyo Dome City Hall.
After graduating from Hello! Project, Hirose Ayaka plans to attend music college starting in April, with the aim of becoming a soloist. Nomura Minami will concentrate on acting, and Hamaura Ayano will aim for modeling and acting, also mentioning that in the future she may continue to utilize music in some small way. Wada Sakurako will graduate from Hello! Project and retire from the entertainment industry. Inoue Rei will continue as a member of Hello! Project in an as-of-yet unknown role. The members concluded their statements by thanking the fans for the constant support over the past five years and for continuing to support them until the end.
- [2017.03.22] Butai "JK Ninja Girls" Original Soundtrack (舞台「JKニンジャガールズ」オリジナルサウンドトラック)
- [2017.09.06] Eiga&Butai "JK Ninja Girls" Original Soundtrack (映画＆舞台「JKニンジャガールズ」オリジナルサウンドトラック)
- [2015.04.21] Nen ni wa Nen / Survivor (念には念 / サバイバー) (Indies)
- [2015.09.02] Dosukoi! Kenkyo ni Daitan / Ramen Daisuki Koizumi-san no Uta / Nen ni wa Nen (Nen Iri Ver.) (ドスコイ!ケンキョにダイタン / ラーメン大好き小泉さんの唄 / 念には念 (念入りVer.))
- [2016.02.17] Sakura Night Fever / Chotto Guchoku ni! Chototsu Moushin / Osu! Kobushi Damashii (桜ナイトフィーバー / チョット愚直に！猪突猛進 / 押忍！こぶし魂)
- [2016.07.27] Samba! Kobushi Janeiro / Bacchikoi Seishun! / Ora wa Ninkimono (サンバ！こぶしジャネイロ / バッチ来い青春！/ オラはにんきもの)
- [2017.06.14] Shalala! Yareru Hazu sa / Eejanaika Ninjanaika (シャララ！やれるはずさ / エエジャナイカ ニンジャナイカ)
- [2018.03.28] Korekara da! / Ashita Tenki ni Naare (これからだ！ / 明日テンキになあれ)
- [2018.08.08] Kitto Watashi wa / Naseba Naru (きっと私は / ナセバナル)
- [2019.04.24] Oh No Ounou / Haru Urara (Oh No 懊悩 / ハルウララ)
- [2020.03.04] Seishun no Hana / Start Line (青春の花 / スタートライン)
- Concerts / Live
- [2016.10.19] Kobushi Factory Live Tour 2016 Haru ~The Cheering Party!~ (こぶしファクトリー ライブツアー2016春 ～The Cheering Party！～)
- [2018.01.17] OTODAMA SEA STUDIO 2017 ～SUMMER FACTORY～
- [2018.09.05] Kobushi Factory & Tsubaki Factory Premium Live 2018 Haru "KOBO" (こぶしファクトリー&つばきファクトリー プレミアムライブ2018春 “KOBO”)
- [2019.01.16] OTODAMA SEA STUDIO 2018 ~Kobushi Natsu Damashii!!~ (OTODAMA SEA STUDIO 2018 ～こぶし夏魂！！～)
- [2019.09.04] Kobushi Factory First Concert 2019 Haru Urara ~GW Special~ (こぶしファクトリー ファーストコンサート2019 春麗 〜GWスペシャル〜)
- Stage Play
- [2015.08.05] Engeki Joshi-bu Musical "Week End Survivor" (演劇女子部 ミュージカル 「Week End Survivor」)
- [2017.07.05] Butai "JK Ninja Girls" (舞台「JKニンジャガールズ」)
- Event V / Single V
- [2016.04.03] Sakura Night Fever (桜ナイトフィーバー)
- [2016.04.03] Chotto Guchoku ni! Chototsu Moushin (チョット愚直に!猪突猛進)
- [2016.04.03] Osu! Kobushi Tamashii (押忍!こぶし魂)
- [2016.08.13] Samba! Kobushi Janeiro (サンバ！こぶしジャネイロ)
- [2016.08.13] Bacchikoi Seishun! (バッチ来い青春！)
- [2016.08.13] Ora wa Ninkimono (オラはにんきもの)
- [2017.08.08] Shalala! Yareru Hazu sa / Eejanaika Ninjanaika (シャララ！やれるはずさ / エエジャナイカ ニンジャナイカ)
- [2018.10.07] Kitto Watashi wa / Naseba Naru (きっと私は) / ナセバナル)
- [2018.04.14] Korekara da! / Ashita Tenki ni Naare (これからだ！ / 明日テンキになあれ)
- [2019.06.02] Oh No Ounou / Haru Urara (Oh No 懊悩／ハルウララ)
- DVD Magazines
- [2015.11.06] Kobushi Factory DVD Magazine Vol.1
- [2016.05.03] Kobushi Factory DVD Magazine Vol.2
- [2016.12.17] Kobushi Factory DVD Magazine Vol.3
- [2017.05.16] Kobushi Factory DVD Magazine Vol.4
- [2017.10.07] Kobushi Factory DVD Magazine Vol.5
- [2017.10.21] Kobushi Factory DVD Magazine Vol.6
- [2018.04.08] Kobushi Factory DVD Magazine Vol.7
- [2018.05.03] Kobushi Factory & Tsubaki Factory DVD Magazine Vol.1
- [2018.10.31] Kobushi Factory DVD Magazine Vol.8
- [2019.05.03] Kobushi Factory DVD Magazine Vol.9
Compilations / Other
- [2015.12.16] Hello! Project - Petit Best 16 (#13 Nen ni wa Nen, #14 Dosukoi! Kenkyo ni Daitan, #15 Survivor)
- [2016.12.14] Hello! Project - Petit Best 17 (#6 Chotto Guchoku ni! Chototsu Moushin)
- [2017.12.13] Hello! Project - Petit Best 18 (#7 Shalala! Yareru Hazu sa, #12 Yami ni Nukegake (Movie Version))
- [2018.12.12] Hello! Project - Petit Best 19 (#11 Ashita Tenki ni Naare, #12 Kitto Watashi wa, #15 Hyokkori Hyoutanjima)
- [2020.01.08] Hello! Project - Petit Best 20 2020 (Disc 1 #9 Shalala! Yareru Hazu sa, Disc 3 #2 Keseyashinai Kimochi)
-  The 57th Japan Record Awards 2015 "New Artist"
-  The 57th Japan Record Awards 2015 "Best New Artist"
- Official Website
- Official Group Blog
- Official YouTube
- Official Twitter
- Official Facebook
- Official Instagram