To provide a backlash removing mechanism which can transmit not only a light rotation torque but the rotation torque with some degree.

Plural grooves having a slant surface in the circumference direction are provided on the equally divided circumferential angle position on the joining surface 12a of one side gear 12 out of a gears 12, 14 having mutually joining surface and the same number of projections are provided in the position corresponding to the grooves on the joining surface 14a of the other gear 14 and steel balls are interposed between the projections and the slant surface of the groove and both gears 12, 14 are tightened through a coned disc spring 16, thereby, enlarges the transmitted rotation torque.