To provide an easily removable odontotherapy chair cover easily changing the color of the seat into a desirable one and used many times by washing while keeping the texture seated on the odontotherapy chair cover.

This odontotherapy chair cover 1 covers parts of the surface, side faces and rear face of the seat part of the odontotherapy chair along the shape of the seat part of the odontotherapy chair and is detachably fixed to the odontotherapy chair at the rear surface of the seat part of the odontotherapy chair with a string inserted into a cylindrical part of the circumferential edge part 3 formed by sewing the edge of the odontotherapy chair cover 1 into the cylindrical part. A cloth made of the same quality of the seat (top layer) of the odontotherapy chair and having a desired color is used as the cover 1.