A light reflecting member (11) has a mirror face (111) adapted to reflect incident light (IL). A first arm member (121) and a second arm member (122) are bonded to the light reflecting member (11). A first actuator (131) and a second actuator (132) are configured to cause the first arm member (121) and the second arm member (122) respectively to displace in a direction intersecting the mirror face (111) to change an angle of the mirror face (111) relative to the incident light (IL). A thermal expansion coefficient of a material forming the light reflecting member (11) is smaller than a thermal expansion coefficient of a material forming each of the first arm member (121) and the second arm member (122).