2011-2017: ASH activities, joining STU48
Chiho joined the Actors School Hiroshima (ASH) as part of it's 26th generation sometime in 2011. On January 22, 2016, during the Shimane Furusato Fair 2016 in Hiroshima, Japan, she was revealed as a member of the ASH PR unit "peony".
Chiho passed the second screening round for STU48's 1st Generation on February 18, 2017 and the final screening round on March 19. During the ASH 2017 SPRING ACT in Hiroshima, Japan on March 20, it was revealed that Chiho would stop her activities as part of peony and graduate from ASH to join STU48. She was officially announced as part of STU48's 1st Generation on March 31 of the same year.
2018-2020: STU48 1st Single, Solo Concert. Photobook
After a delay of three months, Chiho debuted as part of STU48, with the single album "Kuruyami" on January 31, 2018. After applying in March, Chiho ranked #99 with a total of 14,537 votes in AKB48's 10th Senbatsu Election, announced on June 16.
On December 17, through AKB48's Ameba Blog, Chiho's first solo concert STU48 Ishida Chiho solo concert ~Ie! ni Kaeru Made ga Chiho Kondesu~ was announced to be held on January 24, 2020 at Tokyo Dome City Hall.
During Chiho's 18th Birthday Theater performance Chiho wa Shugyoo-chuu held on July 7, 2020, she announced that she will join TWIN PLANETs actor/actress section "WILD PLANET" to become an actress through her solo activities.
On October 25, it was revealed that her first photobook will be released on December 2. The photos were shot at the beaches of Hiroshima, representing the "past", and Okinawa, representing the "present". The title was revealed to be Lemon no Kisetsu on November 6.
2021-present: Senbatsu Center, Hiatus
AKB48 Senbatsu Elections
- 9th Senbatsu Election - Not Ranked
- 10th Senbatsu Election - #99 (The 10th AKB48 World Senbatsu Sousenkyo Kinen Waku)
AKB48 Janken Tournaments
- 8th Janken Taikai - Round 2 (as Kadoishi Ishi; lost to Sankon)
- 9th Janken Taikai - Preliminary Battle (as Fuuchiho; lost to Fortune cherry)
- STU1 (GO!GO! little SEABIRDS!!)
- Amairo no Kamu no Otome
- Megumi no Hito
- Hitomi wo Tojite
- [2020.01.24] - STU48 Ishida Chiho solo concert ~Ie! ni Kaeru Made ga Chiho Kondesu~
- [2020.12.02] Remon no Kisetsu
- Showroom Audition Number: #31
- Audition song: Yume no Kawa
- Close friends with: Yabushita Fu (FuuChiho)
- Former Actor School Hiroshima (ASH) student and a member of peony and MAX♡GIRLS
- Friends with Lyrical Lily member Tanda Hazuki, who was also a former ASH student.
- Also said to look like each other
- 2nd original STU48 member to be included in AKB48 Senbatsu (the first being STU48's center, Takino Yumiko).
- Her favorite foods are Okonomiyaki and mint chocolate.
- (JPN) @shimanekko_ on Twitter: 「島根ふるさとフェア2016」では、島根PRユニット「Peony」 [...] (January 22, 2016)
- (JPN) @ASH_TSS on Twitter: 皆様もご存じかと思いますが この度, アクターズスクール広島から [...] (March 20, 2017)
- (JPN) ORICON: STU48, デビュー曲センターは瀧野由美子 33人中16人選抜 (July 8, 2017)
- (JPN) ORICON: STU48, CDデビュー年明けに延期 11月1日→来年1月31日に (August 18, 2017)
- (JPN) Nikkan Sports: AKB半年ぶりシングル、矢作センター/選抜一覧 (July 22, 2019)
- (JPN) AKB48 Official Blog: 2020年1月TOKYO DOME CITY HALLイベント/後半チケット先行発売のご案内 (December 17, 2019)
- (JPN) AKB48＠メモリスト: 石田千穂「ちほは修行中」公演 ～石田千穂 生誕祭～ トピックス＆セットリスト (July 7, 2020)
- (JPN) TWIN PLANET: ツインプラネット内, 女優・俳優セクション「ワイルドプラネット」に石田千穂(STU48）が所属いたしました. (July 7, 2020)
- (JPN) Nikkan Sports: 石田千穂「素の私」１ｓｔ写真集で水着姿はSTU初 (October 26, 2020)
- (JPN) @chiho1st_ishida on Twitter: [...] その名も「檸檬の季節」です [...] (November 6, 2020)
- (JPN) @STU48_official_ on Twitter: 6thシングルのセンターは石田千穂に決定 [...] (January 15, 2021)
- (JPN) STU48 Blog: STU48 石田千穂 活動休止のご報告 (April 5, 2021)
- (JPN) STU48 Blog: STU48 石田千穂 活動再開のお知らせ (June 29, 2021)