There is provided a polygon mirror scanner motor including: a rotor configured to rotate around a rotation axis; a fitting member configured to be fitted to an outer circumferential surface of the rotor; and a polygon mirror configured to be fitted to the outer circumferential surface of the rotor and bonded with the fitting member, wherein a diameter of the rotor at a part, to which the fitting member is fitted, is configured to be smaller than a diameter of the rotor at a part, to which the polygon mirror is fitted.