A lens drive device may include a movable body holding a lens and a drive mechanism for driving the movable body in the optical axis direction. The drive mechanism may include a drive magnet part formed in a substantially triangular prism shape which is disposed at least one of four corners of the lens drive device, a drive coil wound around in a substantially triangular tube shape so that its inner peripheral face is oppositely disposed to an outer peripheral face of the drive magnet part through a gap space, and a magnetic member which is disposed on an object side with respect to the drive coil. The magnetic member is attracted toward an intermediate position of the drive magnet part in the optical axis direction.