The optical scanner comprises: a motor having an rotor shaft; a rotor being attached to the rotor shaft; a tilt mirror having an inclined reflective surface and being attached to the rotor shaft together with the rotor; and a bearing section being provided to a stator housing and capable of rotatably holding the rotor shaft. The rotor and the tilt mirror are prohibited from detaching from and rotating with respect to the rotor shaft. A recessed part, through which the rotor shaft is penetrated, is formed in the tilt mirror. An elastic member, which always biases the tilt mirror toward the rotor, is provided between a retainer section and an inner bottom part of the recessed part.