Mitsukuri competed at the 1960 Summer Olympics in Rome where he received a gold medal in team combined exercises.

[2] Individually, he performed best on the pommel horse, finishing in fourth and sixth place in 1960 and 1964, respectively.

[3] Mitsukuri received a bronze medal in pommel horse at the 1962 World Artistic Gymnastics Championships, and Japan won the team competition.

He received a bronze medal in horizontal bar at the 1966 World Artistic Gymnastics Championships, and Japan won the team competition again.

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