A linear actuator that can achieve downsizing with a simple configuration, and can provide stable linear reciprocation while achieving improvement in assemblability and cost reduction. In the actuator, fixing body 40 includes electromagnet (20) having coil (21). Movable member (50) faces coil (21) in the winding axis (CL) direction of coil (21), and in addition, includes magnet (30) magnetized in the coil-winding axis (CL) direction in a unipolar fashion and output shaft (60) extending in the (CL) direction. Elastic body (70) is disposed along the coil-winding axis (CL) direction and configured to deform in that direction to supports movable member (50) such that movable member (50) can reciprocate along the coil-winding axis (CL) direction. Elastic body 70 is fixed to fixing body (40) and movable member (50) at both ends (71) and (72) in the coil-winding axis (CL) direction such that central air gap (CG) is formed between electromagnet (20) and magnet (30).
