Optical unit

An optical unit comprising:

• a reflection portion, configured to reflect an incident light flux incident from outside in a reflection direction from an incident direction to an imaging element on a reflection surface;
• a movable body, configured to support the reflection portion;
• a fixed body;
• and
• a rotation support mechanism, configured to rotate the movable body with respect to the fixed body with an axial direction crossing the incident direction and the reflection direction as a rotation axis, wherein
• the rotation support mechanism has:
• a spring member in a U-shape that is disposed between the fixed body and the movable body in the axial direction and applies a force in a widening direction to widen a space between the fixed body and the movable body in the axial direction;
• the spring member has a rotation-axis first forming member that constitutes the rotation axis;
• the movable body has a rotation-axis second forming member that constitutes the rotation axis together with the rotation-axis first forming member;
• and
• the rotation-axis first forming member and the rotation-axis second forming member are disposed at positions where the rotation axis passes through a center of gravity position of the movable body.