is a Japanese swimmer.
Career On 21 March 2026, Kojima set a world junior record in the 200 metre individual medley with a time of 1:56.53. In August 2026, he competed at the 2026 Pan Pacific Swimming Championships and won a gold medal in the 200 metre backstroke with a time of 1:55.38. He also lowered his own world junior record during the heats of the 400 metre individual medley with a time of 4:08.69.
In September 2026, he competed at the 2026 Asian Games. On the first day of the Asian Games he won a silver medal in the 200 metre individual medley with a world junior record time of 1:55.36. On the third day of the competition he won a gold medal in the 400 metre individual medley with an Asian Games record and world junior record time of 4:07.02.
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