Optical path shifting device and image display device

An optical path shifting device comprising:

• an optical member having a shape of a rectangular plate and on which incident light is incident;
• a holding frame holding the optical member;
• a support part supporting the holding frame in a swingable state;
• and
• an actuator causing the holding frame to swing, wherein
• the optical member has a first corner part and a second corner part opposite each other, and a third corner part and a fourth corner part opposite each other in a direction intersecting a diagonal line connecting the first corner part and the second corner part,
• the holding frame has a first shaft part provided at a position opposed to the first corner part, and a second shaft part provided at a position opposed to the second corner part,
• the holding frame is connected to the support part by the first shaft part and the second shaft part, and
• the actuator is arranged at a position opposed to the third corner part.