Kanamaru was born in Tsurugi, Ishikawa,[2] and began to train in judo at the age of 5.

[2] He entered the Ryotokuji Gakuen after graduating from Tsukuba University.

[2] Since 2000, He got a gold medal at the Kodokan Cup, and has been a judoka representing Japan in the Lightweight category.

Kanamaru placed seventh in the men's 73 kg class at the 2008 Summer Olympics.

This biographical article related to Japanese judo is a stub.