| Official |
|---|
| 1.1 | Ring | 5:17 | 平井堅 | Ring | 平井堅 | Single | | DefSTAR RECORDS | DFCL-1086 |
| 1.4 | Ring | 5:15 | 平井堅 | LIFE is... | 平井堅 | Album | | DefSTAR RECORDS | |
| 1.4 | Ring | 5:19 | 平井堅 | LIFE is... | 平井堅 | Album | | DefSTAR RECORDS | DFCL-1092 |
| 1.4 | Ring | 5:15 | Ken Hirai | LIFE is... | Ken Hirai | Album | | SME Records | |
| 2.2 | Ring | 5:18 | 平井堅 | 31HITS~THE GOLD DISC AWARD 2003~ | Various Artists | Album + Compilation | | avex trax | AVCD-17297 |
| 2.6 | Ring | 5:16 | 平井堅 | Ken Hirai 10th Anniversary Complete Single Collection ’95–’05 “歌バカ” | 平井堅 | Album + Compilation | | DefSTAR RECORDS | 82876772242 |
| 2.6 | Ring | 5:16 | 平井堅 | Ken Hirai 10th Anniversary Complete Single Collection ’95–’05 “歌バカ” | 平井堅 | Album + Compilation | | DefSTAR RECORDS | DFCL-1333, DFCL-1334 |
| 2.6 | Ring | 5:16 | 平井堅 | Ken Hirai 10th Anniversary Complete Single Collection ’95–’05 “歌バカ” | 平井堅 | Album + Compilation | | DefSTAR RECORDS | DFCL-1330, DFCL-1331, DFCL-1332 |
| 2.6 | Ring | 5:16 | 平井堅 | Ken Hirai 10th Anniversary Complete Single Collection ’95–’05 “歌バカ” | 平井堅 | Album + Compilation | | DefSTAR RECORDS | SMD 8866, SMD 8867, SMD 8868 |
| 1.3 | Ring | 5:18 | 平井堅 | 冨田恵一 WORKS BEST 〜beautiful songs to remember〜 | 冨田ラボ | Album + Compilation | | rhythm zone | RZCD-46841 |
| 1.3 | Ring | 5:18 | 平井堅 | 冨田恵一 WORKS BEST 〜beautiful songs to remember〜 | 冨田ラボ | Album + Compilation | | rhythm zone | RZCD-46838, RZCD-46839, RZCD-46840 |
| 2.2 | Ring | 5:16 | 平井堅 | Ken Hirai Singles Best Collection 歌バカ 2 | 平井堅 | Album + Compilation | | Ariola Japan | 88985460452 |
| 2.2 | Ring | 5:16 | 平井堅 | Ken Hirai Singles Best Collection 歌バカ 2 | 平井堅 | Album + Compilation | | Ariola Japan | BVCL-807, BVCL-808, BVCL-809, BVCL-810 |
| 1.4 | Ring | ?:?? | 平井堅 | LIFE is... | 平井堅 | Album | | Ariola Japan | MATO-7540 |
| 1.17 | Ring | 5:16 | 平井堅 | Ken Hirai 10th Anniversary Complete Single Collection ’95–’05 “歌バカ” | 平井堅 | Album + Compilation | | DefSTAR RECORDS | |
| Pseudo-Release |
|---|
| 1.4 | Ring | 5:17 | Ken Hirai | Life Is... | Ken Hirai | Album | | | |