is a Japanese football manager and former player who play as a Defender and currently manager of Shibuya City FC.
After three seasons playing for JEF United Chiba, Masushima retired in December 2020.
In June 2005, Masushima was selected Japan U-20 national team for 2005 World Youth Championship. At this tournament, he played all 4 matches as center back.
On 8 January 2023, Masushima announcement officially manager of Shibuya City FC for ahead of 2023 season.
Masushima married badminton player Reiko Shiota on September 30, 2012.
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<div id="notes gs1"></div><sup>1</sup><small>Includes AFC Champions League.</small> <div id="notes gs1"></div><sup>2</sup><small>Includes FIFA Club World Cup, Japanese Super Cup and Suruga Bank Championship.</small>