# Motoka Arai

Motoka Arai (新井 初佳, Arai Motoka, born 16 June 1974 in Kobe) 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. 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. She changed her name to Motoka Kojima, but she reverted to her original name.

## Personal bests

| 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 | |
| 100 m | 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 |
| 200 m | 23.22 (wind: +2.2 m/s) | National Championships | Shizuoka, Japan | 3 October 1999 | Wind-assisted |
| 200 m | 24.11 (Indoor) | Japan-China Indoor Match | Yokohama, Japan | 26 February 2000 | Current NIR |

## International competition

| Year | Competition | Venue | Position | Event | Time |
| Representing Japan ||||||
| 1997 | East Asian Games | Busan, South Korea | 3rd | 200 m | 24.09 (wind: +3.4 m/s) |
| 1997 | East Asian Games | Busan, South Korea | 2nd | 4×100 m relay | 45.16 (relay leg: 4th) |
| 1997 | East Asian Games | Busan, South Korea | 2nd | 4×400 m relay | 3:36.60 (relay leg: 2nd) |
| 1997 | 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) |
| 1998 | Asian Championships | Fukuoka, Japan | 5th | 200 m | 23.67 (wind: +1.7 m/s) |
| 1998 | Asian Championships | Fukuoka, Japan | 2nd | 4×100 m relay | 44.45 (relay leg: 4th) |
| 1998 | Asian Games | Bangkok, Thailand | 5th | 100 m | 11.59 (wind: +2.3 m/s) |
| 1998 | Asian Games | Bangkok, Thailand | 6th | 200 m | 23.58 (wind: +0.1 m/s) |
| 1998 | Asian Games | Bangkok, Thailand | 5th | 4×100 m relay | 44.80 (relay leg: 2nd) |
| 1999 | World Indoor Championships | Maebashi, Japan | 26th (h) | 60 m | 7.54 |
| 1999 | World Indoor Championships | Maebashi, Japan | — (h) | 200 m | DNS |
| 1999 | World Championships | Seville, Spain | 37th (h) | 100 m | 11.64 (wind: -0.6 m/s) |
| 1999 | World Championships | Seville, Spain | 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) |
| 2000 | Asian Championships | Jakarta, Indonesia | 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) |
| 2001 | East Asian Games | Osaka, Japan | 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) |
| 2002 | Asian Games | Busan, South Korea | 6th | 200 m | 23.91 (wind: -0.2 m/s) |
| 2002 | Asian Games | Busan, South Korea | 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) |
| 2003 | Asian Championships | Manila, Philippines | 2nd | 4×100 m relay | 44.56 (relay leg: 1st) |

## National titles

* Japanese Championships
** 100 m: 1998, 1999, 2000, 2001, 2002, 2003, 2004
** 200 m: 1998, 1999, 2000, 2001, 2002, 2003