A camera lens positioning device is provided that comprises a housing, a camera lens supporting member provided in the housing such that it can move in a direction away from a subject and a direction toward the subject, a member which applies force to the lens supporting member in either the direction away from the subject or the direction toward the subject, a first shape memory alloy which can move the lens supporting member in the direction opposite to the direction in which the force applying member applies force by applying force to the lens supporting member in the opposite direction, and a second shape memory alloy which can move a stopping member in the relationship with the lens supporting member. The device can stop the lens supporting member between a first position away from the subject and a second position close to the subject by use of the stopping member. By use of this device, positioning of a camera lens with required accuracy can be provided at low cost, with low electric power and a simple structure and in a small space.