Kojiro Yamazaki (born June 13, 1965) is a Japanese musician who plays drums for The Ohayogozaimas since 2017, beginning with the Maeda EP. Beforehand, he had played some shows as a support drummer for The Ohayogozaimas before they had a dedicated drummer position. He also plays support for other bands, such as N.I.C.K..

Outside The Ohayogozaimas, Kojiro is also a member of JYOCHO and komodo Inc., and plays support drums for other groups.

Kojiro Yamazaki's drum styling is mainly focused on pop music and jazz fusion, So playing the drums for a metal band like The Ohayogozaimas was initially a challenge. In fact, he had trouble after performing the first show with The Ohayogozaimas as a support drummer.

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