An angle adjustment apparatus includes a holder including a first surface, a base member that includes a second surface, and a driver driving the holder. At least one surface of the first and second surfaces includes a curved shape. The first surface slides around a plurality of axes passing through a center of curvature of the curved shape to the second surface according to a position where the driving force is applied to the holder. Sliding the first surface on the second surface allows the holder to tilt to the base member. The driver applies driving force to a surface of the holder perpendicular to a first direction when driving the holder in the first direction, and applies driving force to a surface of the holder perpendicular to a second direction orthogonal to the first direction when driving the holder in the second direction.