A voice coil motor includes a movable member, a base, and a first elastic member. The movable member comprises a barrel, and a plurality of fixing posts protrudes from the bottom of the barrel. The base defines a through hole, a plurality of recessed portions, and a plurality of concavities. The axis of through hole is coaxial with the barrel. The recessed portions surround the aperture. Each of the recessed portions is arranged between two concavities. The depth of the recessed portion is less than the height of the fixing post, and the depth of the concavity is larger than that of the recessed portion. The elastic member comprises an elastic portion, which defines a first fixing hole. The fixing post extends through the first fixing hole and is received in the recessed portion.