Debutants
Ayumi Nakajima is the youngest debutant in Tour of Japan in 2021. There are 43 debutants.
| # | Rider | Team | Age |
|---|---|---|---|
| 1 | NAKAJIMA Ayumi | Yowamushi Pedal Cycling Team | 18y + 173d |
| 2 | NISHIMOTO Kenzaburo | LEOMO Bellmare Racing Team | 18y + 239d |
| 3 | YAHAGI Yuya | Kyoto Sangyo University | 18y + 257d |
| 4 | NAKAMURA Eito | Kyoto Sangyo University | 18y + 298d |
| 5 | TODOME Yuhi | Japan | 18y + 344d |
| 6 | YOSHIDA Keigo | Kyoto Sangyo University | 19y + 96d |
| 7 | SUZUKI Raito | Team Eurasia - iRC TIRE | 19y + 130d |
| 8 | WU Chuluo | Nihon University | 19y + 131d |
| 9 | AMANO Takeharu | Japan | 19y + 159d |
| 10 | TAKANASHI Mario | Levante Fuji Shizuoka | 19y + 179d |
| 11 | SHONO Yuto | Nihon University | 19y + 188d |
| 12 | YAMADA Takumi | Japan | 19y + 208d |
| 13 | UMINO Shinsaku | Levante Fuji Shizuoka | 19y + 229d |
| 14 | UWANO Hayato | Kyoto Sangyo University | 19y + 260d |
| 15 | KAWANO Aoki | Yowamushi Pedal Cycling Team | 19y + 299d |
| 16 | KARIYA Kazutoshi | Nihon University | 20y + 60d |
| 17 | TAKAHASHI Shun | Nihon University | 20y + 66d |
| 18 | YUASA Hirotaka | Team Eurasia - iRC TIRE | 20y + 74d |
| 19 | TANI Shota | Nihon University | 20y + 122d |
| 20 | HIRAI Kosuke | Japan | 20y + 238d |
| 21 | IROKAWA Takehiro | Team Eurasia - iRC TIRE | 20y + 293d |
| 22 | KAYAMA Hiryu | Yowamushi Pedal Cycling Team | 20y + 311d |
| 23 | TERASAWA Andrew | Team Eurasia - iRC TIRE | 20y + 363d |
| 24 | KAWANO Shouki | Team Bridgestone Cycling | 21y + 63d |
| 25 | SATO Takashi | Nasu Blasen | 21y + 170d |
| 26 | KOMURA Haruki | Team Eurasia - iRC TIRE | 21y + 182d |
| 27 | KOIDE Itsuki | Kyoto Sangyo University | 21y + 218d |
| 28 | KADOTA Yusuke | LEOMO Bellmare Racing Team | 22y + 283d |
| 29 | ONO Hiroto | Sparkle Oita Racing Team | 23y + 10d |
| 30 | KOBAYASHI Hiroyuki | LEOMO Bellmare Racing Team | 23y + 50d |
| 31 | SAWADA Keitaro | Sparkle Oita Racing Team | 23y + 127d |
| 32 | ISHIGAMI Masahiro | Japan | 23y + 220d |
| 33 | INOUE Fuminari | Yowamushi Pedal Cycling Team | 23y + 281d |
| 34 | ISHII Shunpei | Levante Fuji Shizuoka | 24y + 55d |
| 35 | NAKAMURA Kaito | Utsunomiya Blitzen | 24y + 128d |
| 36 | KOJIMA Keien | Utsunomiya Blitzen | 24y + 156d |
| 37 | NOMIYA Ichiro | Levante Fuji Shizuoka | 25y + 351d |
| 38 | SHIBATA Masayuki | Nasu Blasen | 26y + 206d |
| 39 | YOKOTSUKA Kohei | Team UKYO | 26y + 293d |
| 40 | TANI Junsei | Nasu Blasen | 26y + 297d |
| 41 | SAWADA Toki | Team Bridgestone Cycling | 27y + 136d |
| 42 | NISHIO Hayato | Nasu Blasen | 27y + 139d |
| 43 | SAITA Naoto | LEOMO Bellmare Racing Team | 35y + 303d |