Ranging device

A ranging device configured to measure a distance to an object by scanning an outside with light and detecting the light reflected from the object, the ranging device comprising:

• a mirror configured to oscillate to scan the outside with the light;
• an oscillating shaft to which the mirror is fixed;
• and
• an actuator configured to drive the oscillating shaft to oscillate by being energized, wherein
• the actuator includes:
• a rotor magnet having a tubular shape, the rotor magnet through which the oscillating shaft is inserted;
• and
• a rotor fixing portion fixing the rotor magnet to the oscillating shaft,
• the rotor fixing portion restricts the rotor magnet from moving in an axial direction, a radial direction, and a rotational direction of the oscillating shaft,
• the rotor fixing portion includes:
• a retaining plate disposed on one side of the rotor magnet in the axial direction and fixed to the oscillating shaft;
• and
• an elastic member disposed on an other side of the rotor magnet in the axial direction,
• the oscillating shaft is rotatably supported by a bearing,
• the bearing, the elastic member, the rotor magnet, and the retaining plate are arranged in this order in the axial direction, and
• the rotor magnet and the retaining plate are fixed together by an interposed member.