[1] On April 2, 2006, Kawashima debuted in the Pacific League against the Orix Buffaloes.

[5] On January 11, 2008, Kawashima was traded to the Tokyo Yakult Swallows.

[8] He chose conservative therapy without surgery, but his recovery was poor.

In 2011 season, Kawashima recovered from the injury to the team, but broke his middle finger on April 12, the first game he returned to, on a hit by pitch.

Kawashima had a recurrence of pain in his right elbow and underwent Tommy John surgery on October 20.

[16] In the match against Nippon-Ham Fighters on April 3, 2016, Kawashima crossed with runner Kensuke Tanaka on the second base and injured his right lower leg.

[18] In the 2017 Japan Series against the Yokohama DeNA BayStars, Kawashima hit the game-winning run batted in single in Game 6, deciding the team's Japan Series champion.

[21] In 2019 season, Kawashima played only 47 games due to left shoulder pain,[22] but recorded a batting average of .364.