Actuator device manufacturing method

An actuator device manufacturing method comprising:

• in the following order,
• a preparation step of preparing an actuator device including a support portion, a movable portion, a connection portion that connects the movable portion to the support portion such that the movable portion is oscillatable around a predetermined axis, and a metal member disposed such that a stress acts on the metal member when the movable portion oscillates around the axis;
• an oscillation step of oscillating the movable portion around the axis for a predetermined time;
• an acquisition step of acquiring a parameter related to a viscous resistance in a vibration of the movable portion around the axis;
• and
• a determination step of determining that the actuator device is qualified, when a difference between the parameter acquired in the acquisition step and a reference value corresponding to the parameter at a start of the oscillation step is a predetermined value or more in a direction in which the viscous resistance decreases, and determining that the actuator device is disqualified, when the difference is less than the predetermined value.