| Motoka Arai | |
| Nationality: | Japanese |
| Birth Place: | Kobe, Japan[1] |
| Alma Mater: | Konan University |
| Height: | 1.57m (05.15feet)[2] |
| Weight: | 50kg (110lb) |
| Country: | Japan |
| Sport: | Track and field |
| Event: | Sprints |
| Retired: | September 2008[3] |
| Pb: | 60 m: 7.54 (1999) 100 m: 11.39 (2004) 200 m: 23.46 (1999) |
is a Japanese retired sprinter. She competed in the 4 × 100 metres relay at the 1997 World Championships, the 100 metres and 4 × 100 metres relay at the 1999 World Championships and the 4 × 100 metres relay at the 2003 World Championships.[4] She was a seven-time national champion in the 100 metres and a six-time national champion in the 200 metres at the Japanese Championships. She is the former Japanese record holder in the 100 metres and 200 metres, and the current Japanese record holder in the indoor 200 metres.
She married Japanese sprinter Shigeyuki Kojima in February 2004.[5] She changed her name to Motoka Kojima, but she reverted to her original name.
| Event | Time (s) | Competition | Venue | Date | Notes |
|---|---|---|---|---|---|
| 60 m | 7.54 (Indoor) | World Indoor Championships | Maebashi, Japan | 7 March 1999 | |
| 100 m | 11.39 (wind: +1.1 m/s) | National Championships | Tottori, Japan | 4 June 2004 | |
| 11.31 (wind: +3.7 m/s) | National Championships | Tokyo, Japan | 9 June 2001 | Wind-assisted | |
| 200 m | 23.46 (wind: 0.0 m/s) | National Sports Festival | Kumamoto, Japan | 26 October 1999 | Former NR |
| 23.22 (wind: +2.2 m/s) | National Championships | Shizuoka, Japan | 3 October 1999 | Wind-assisted | |
| 24.11 (Indoor) | Japan-China Indoor Match | Yokohama, Japan | 26 February 2000 | Current NIR | |
| Year | Competition | Venue | Position | Event | Time |
|---|---|---|---|---|---|
| Representing | |||||
| 1997 | East Asian Games | Busan, South Korea | 3rd | 200 m | 24.09 (wind: +3.4 m/s) |
| 2nd | 4×100 m relay | 45.16 (relay leg: 4th) | |||
| 2nd | 4×400 m relay | 3:36.60 (relay leg: 2nd) | |||
| World Championships | Athens, Greece | 15th (sf) | 4×100 m relay | 44.56 (relay leg: 4th) | |
| 1998 | Asian Championships | Fukuoka, Japan | 4th | 100 m | 11.74 (wind: -0.1 m/s) |
| 5th | 200 m | 23.67 (wind: +1.7 m/s) | |||
| 2nd | 4×100 m relay | 44.45 (relay leg: 4th) | |||
| Asian Games | Bangkok, Thailand | 5th | 100 m | 11.59 (wind: +2.3 m/s) | |
| 6th | 200 m | 23.58 (wind: +0.1 m/s) | |||
| 5th | 4×100 m relay | 44.80 (relay leg: 2nd) | |||
| 1999 | World Indoor Championships | Maebashi, Japan | 26th (h) | 60 m | 7.54 |
| (h) | 200 m | ||||
| World Championships | Seville, Spain | 37th (h) | 100 m | 11.64 (wind: -0.6 m/s) | |
| 14th (h) | 4×100 m relay | 44.80 (relay leg: 2nd) | |||
| 2000 | Asian Championships | Jakarta, Indonesia | 7th | 100 m | 11.78 (wind: -1.0 m/s) |
| 5th | 4×100 m relay | 45.26 (relay leg: 2nd) | |||
| 2001 | East Asian Games | Osaka, Japan | 4th | 200 m | 23.69 (wind: -2.4 m/s) |
| 2nd | 4×100 m relay | 44.24 (relay leg: 2nd) | |||
| 2002 | Asian Games | Busan, South Korea | 9th (h) | 100 m | 11.70 (wind: -0.2 m/s) |
| 6th | 200 m | 23.91 (wind: -0.2 m/s) | |||
| 4th | 4×100 m relay | 44.59 (relay leg: 2nd) | |||
| 2003 | World Championships | Paris, France | 15th (h) | 4×100 m relay | 44.57 (relay leg: 4th) |
| Asian Championships | Manila, Philippines | 2nd | 4×100 m relay | 44.56 (relay leg: 1st) | |