Listed below are the members of Guruguru Eigakan, their full names, and the (main) bands they used to be in other than Guruguru. For side bands, please have a look at the Side Projects section. (Some info here taken from Grass Thread.)
| Vocal & Guitar | 天野鳶丸 (Amano Tonbimaru) | 酸欠マンホール (Sanketsu Manhole) → Guruguru Eigakan |
| Guitar & Vocal | 沼倉真 (Numakura Shin) | CRY《MU》 → ブーメランキックチョップ (Boomerang Kick Chop) → Guruguru Eigakan |
| Drums | 前田一知 (Maeda Kazutomo) | GELGOOG(MASH前田)(as MASH Maeda)→ Shame → Guruguru Eigakan |
| Before Guruguru, Aniki was in Shame together with his real little brother, who is currently the vocalist of ORCA (as Cutt). Shame did a cover of "LEMONed I Scream" on the hide tribute album Spirits. | ||
| Bass | 玉腰勲 (Tamakoshi Isao) | Blind → Guruguru Eigakan (until 11/2006) |
| Vocal ＆ Guitar | 山田俊介 (Yamada Shunsuke) | Guruguru Eigakan (until 07/04/2002)→ |
| Bass & Vocal | 吉川昌利 (Yoshikawa Masatoshi) | Guruguru Eigakan (until 07/04/2002)→ 太平洋ベルト (Taiheiyou Belt) |
| Drums | 松島広治 (Matsushima Kouji) | Guruguru Eigakan (until 07/04/2002)→ |