Ishikawa joined Morning Musume as a fourth generation member along with Hitomi Yoshizawa, Nozomi Tsuji, and Ai Kago, and made her debut in 2000 along with the rest of the fourth generation on the band's tenth single, "Happy Summer Wedding".
In 2001, simultaneously with her Morning Musume obligations, Ishikawa became a featured member of the then-semi-dormant Hello! Project group Country Musume and a second-generation member of Morning Musume's first subgroup, Tanpopo. She also participated in her first shuffle group recording, 3-nin Matsuri, with fellow Morning Musume/Tanpopo member Ai Kago and solo singer Aya Matsuura (previously, she had been a replacement member in the 2000 shuffle group Aoiro 7).
One of Ishikawa's most referenced vocal parts during her Morning Musume days was a frantic spoken word piece in the middle eight of their 2003 single "Shabondama". She also said a spoken word piece at the end of the song "The Peace!" which she has said was one of her favorite Morning Musume moments.
In September 2004, her new trio, v-u-den, released their debut single. She graduated from Morning Musume on May 7, 2005, and after five singles, v-u-den finally released their debut album, Suiteroom Number 1, in November of 2005.
Ishikawa has starred in a Hamtaro movie with her Ecomoni partner, Sayumi Michishige, and soloist Aya Matsuura. She was a Pocky Girl (for Morning Musume's Pocky commercial), and also plays for Gatas Brilhantes H.P..
Ishikawa starred in Sukeban Deka: Codename = Asamiya Saki, the fourth live-action adaptation film of Sukeban Deka opposite Aya Matsuura, released September 30, 2006.
In line with Mari Yaguchi's involvement in the Japanese 2007 adaptation of the popular 1955 Broadway play, "Damn Yankees", Rika will be double casted with fellow 4th Generation ex-Morning Musume member, Nozomi Tsuji, in "When Will You Return?" (『いつの日君帰る』 Istu no hi kimi kaeru?), scheduled to open on May 4, 2007 at the Nissei Theatre in Tokyo, where it'll be performed up to the 22nd. The play will also have a limited three day run at the Osaka City Center from May 25 to May 28.
In mid-2007, Ishikawa joined the group Ongaku Gatas along with fellow members of Gatas Brilhantes H.P..
Hello! Project groups
v-u-den (2004 – June, 2008)
DEF.DIVA (2005 – present)
Ecomoni (2004 – present)
Tanpopo (2000 – 2003)
Morning Musume (2000 – 2005)
Country Musume ni Ishikawa Rika (Morning Musume) (2001 – 2003)
Morning Musume Otomegumi (2003 – 2004)
3-nin Matsuri (2001)
Sexy 8 (2002)
H.P. All Stars (2004)
DVDs and videos# Title Release date
1 Rika & Miki Sugao no 17sai ~Making Of "17sai ~Tabidachi no Futari~"~ 2003-10-21
2 Alo Hello! Rika Ishikawa (アロハロ!石川梨華?) 2007-03-07
TelevisionShow Start date End date
Hai Kara-san ga Tōru 2002-01-02
Tō-san no Natsu Matsuri 2002-08-17
Ore ga Aitsu de Aitsu ga Ore de 2002-12-28
Ranpo R Jigoku Dōkeshi 2003-02-23
Last Present 2003-12-24
Majokko Rika-chan no Magical v-u-den (魔女っ娘。梨華ちゃんのマジカル美勇伝?) 2004-10-04 2004-12-24
Shinshun Wide Jidaigeki "Kunitori Monogatari" 2005-01-02
Musume Dokyu! (娘Dokyu!?) 2005-05-09
Shin Dōmoto Kyōdai (新堂本兄弟?) 2006-06-18
RadioProgram Start date End date
MBS Young Town Dōyōbi 2003-04-03 2004-03-27
v-u-den☆Ishikawa Rika no Chanka☆Charmy! 2004-04-02 2006-09-21
Hello Pro Yanen!! 2005-02-18 2005-03-11
B.B.L. 2005-04-03 2005-04-10
2005-05-08 Currently running
v-u-den Beauty Hour 21 2006-10-06 Currently running
2000 – Pinch Runner
2002 – Tokkaekko
2003 – Koinu Dan no Monogatari
2003 – 17sai ~Tabidachi no Futari~
2004 – Tottoko Hamtaro Hamu Hamu Hapa Radaicho!
2006 – Sukeban Deka: Codename = Asamiya Saki
2003 – J Beef "Oniku Suki Suki"