An optical device comprising: a base that includes a main surface ; a movable unit ; an optical function unit that is disposed on the movable unit , the optical function unit being a mirror surface or a lens; and at least two elastic support units that are connected between the base and the movable unit , and support the movable unit so that the movable unit is capable of moving along a first direction perpendicular to the main surface , wherein the elastic support unit includes, a pair of levers which face each other in a second direction perpendicular to the first direction, a pair of first torsion support portions which extend in the second direction and are respectively connected between the pair of levers and the base , a pair of second torsion support portions which extend in the second direction and are respectively connected between the pair of levers and the movable unit , a first link member that bridges the pair of levers , and a second link member that bridges the pair of levers , a light passage opening is defined by the pair of levers , the first link member , and the second link member , the pair of second torsion support portions is disposed outside of the light passage opening , each of connection positions between the pair of levers and the pair of first torsion support portions is located on a side opposite to the movable unit with respect to the center of the light passage opening in a third direction perpendicular to the first direction and the second direction, and a maximum width of the light passage opening in the second direction is defined by a gap between the pair of levers in the second direction. a base that includes a main surface ; a movable unit ; an optical function unit that is disposed on the movable unit , the optical function unit being a mirror surface or a lens; and at least two elastic support units that are connected between the base and the movable unit , and support the movable unit so that the movable unit is capable of moving along a first direction perpendicular to the main surface , wherein the elastic support unit includes, a pair of levers which face each other in a second direction perpendicular to the first direction, a pair of first torsion support portions which extend in the second direction and are respectively connected between the pair of levers and the base , a pair of second torsion support portions which extend in the second direction and are respectively connected between the pair of levers and the movable unit , a first link member that bridges the pair of levers , and a second link member that bridges the pair of levers , a light passage opening is defined by the pair of levers , the first link member , and the second link member , the pair of second torsion support portions is disposed outside of the light passage opening , each of connection positions between the pair of levers and the pair of first torsion support portions is located on a side opposite to the movable unit with respect to the center of the light passage opening in a third direction perpendicular to the first direction and the second direction, and a maximum width of the light passage opening in the second direction is defined by a gap between the pair of levers in the second direction. <EOS>