| Release date | Title | B-side | Format | Oricon ranking |
|---|---|---|---|---|
| September 1, 1985 | 涙の茉莉花LOVE | 恋のチャプターA to Z | Vinyl (07SH 1684) | 1st |
| November 21, 1985 | 落葉のクレッシェンド | 午後のパドドゥ | Vinyl | 2nd |
| March 21, 1986 | 青いスタスィオン | さよならは言わないで | Vinyl (07SH 1748) | 1st |
| July 2, 1986 | 再会のラビリンス | ジョバンニのささやき | Vinyl, cassette (10KH 1913) | 1st |
| October 22, 1986 | 悲しい夜を止めて | やさしさなんていらない | Vinyl | 1st |
| February 26, 1987 | 哀愁のカルナバル | ロマンスの行方 | Vinyl, cassette (10KH 2088) | 3rd |
| June 17, 1987 | JESSY | 赤道を越えたサマセットモーム | Vinyl | 3rd |
| February 26, 1987 | 夢から醒めた天使 | 明日への手紙 | Vinyl, cassette (10KH 2340) | 11th |
| April 21, 1988 | 雨のメモランダム | ラヴェンダーが目印 | Vinyl (07SH 3028), 8cm CD (10EH 3028) | 29th |
| Release date | Title | Format | Oricon ranking |
|---|---|---|---|
| December 5, 1985 | その子 | Vinyl, CD, Cassette | 4th |
| May 21, 1986 | Siesta | Vinyl, CD (32DH 446), Cassette | 1st |
| October 1, 1986 | Mode de Sonoko | Vinyl, CD, Cassette | 1st |
| July 22, 1987 | Rouge et Bleu | Vinyl, CD (32DH 697), Cassette | 6th |
| May 21, 1988 | Colors | Vinyl, CD (32DH 5050), Cassette (28KH 5050) | 19th |
| March 21, 1989 | Dancin' In The Light | CD, Cassette | 38 |
| April 21, 1990 | Replica | CD | 50 |
| Release date | Title | Format | Oricon ranking | Notes |
|---|---|---|---|---|
| January 1, 1988 | Dedication | LP, CD (32DH 869) | 15th | - |
| January 1, 1988 | BEST ALBUM | Cassette | 60th | - |
| July 21, 1988 | 雨の木 | 8cm CD | - | Part of the "My Favorite Songs" series. |
| December 21, 1990 | sonnet | CD | 83rd | - |
| July 21, 1997 | 河合その子 ベスト・コレクション | CD | - | - |
| November 20, 2002 | GOLDEN☆BEST 河合その子 | CD | - | - |
| April 28, 2010 | GOLDEN☆BEST 河合その子・国生さゆり・城之内早苗・渡辺美奈代・渡辺満里奈 | CD | - | - |
| Release date | Title | Oricon ranking | Notes |
|---|---|---|---|
| September 30, 2009 | Sonoko Kawai Premium | 138th | - |
| Release date | Title | Format | Notes |
|---|---|---|---|
| March 21, 1986 | その子 元気です。 | Laserdisc, VHS, DVD | Format was changed to DVD and re-released on July 22, 2004. |
| March 5, 1987 | アフロディーテの夢 -Aphrodite- | DVD, Laserdisc | Column 4 |
| November 21, 1987 | その子の夏 | Laserdisc, DVD | Format was changed to DVD and re-released on September 23, 2004. |
| March 5, 1988 | JESSY | CDV | - |
| July 21, 1989 | Sweet Contrast | Laserdisc, DVD | - |
| Release date | Title | Notes |
|---|---|---|
| February 21, 2007 | 河合その子 コンプリートDVD-BOX | - |
| Title | Notes |
|---|---|
| 落葉のクレッシェンド | Ending theme for Fuji TV's "なるほど!ザ・ワールド" |
| 午後のパドドゥ | Jingle for Morinaga Confectionery's "HI-SOFT" |