PROBLEM TO BE SOLVED: To suppress an optical scanner from becoming large in thickness and to align a direction where light is emitted from the optical scanner with a direction where the light is made incident on the optical scanner.SOLUTION: A first fixed reflection part 202 is located on the side opposite to a second movable reflection part 104 across a first movable reflection part 102 and reflects incident light toward the first movable reflection part 102. A second fixed reflection part 204 is arranged between the first movable reflection part 102 and the second movable reflection part 104 and reflects the incident light reflected by the first movable reflection part 102 toward the second movable reflection part 104. A third fixed reflection part 206 is arranged on the side opposite to the first movable reflection part 102 across the second movable reflection part 104 and reflects the incident light reflected by the second movable reflection part 104 in a direction away from the second movable reflection part 104. The reflection surface of the second fixed reflection part 204 is along the surface of an ellipsoidal body. The focus of the ellipsoidal body is overlapped with the first movable reflection part 102 and the second movable reflection part 104.
