A lens driver (20a) includes: an imaging lens (21a); a housing (24a) accommodating the lens; a spring member (28) provided between the lens (21a) and the housing (24a) and holding the lens (21a) in the housing (24a) movably in the optical axis direction; a coil (31) moving the lens (21a) in the optical axis direction; a magnet (32) spaced apart from the coil (31) and moving the lens (21a) in the optical axis direction; and a yoke (33) fixed to the magnet (32) and having an L-shaped cross-section when taken along a plane including the optical axis, wherein the yoke (33) is disposed in such a way that an L-shaped corner side is located on the opposite side to the position of the lens (21a) where the reaction force of the spring member (28) resulting from the movement of the lens (21a) is maximized.