<p>Provided is an actuator whereby further size reduction can be achieved. Disclosed is an actuator (3) wherein: a conversion member (7) is connected to a drive element (10) such that the displacement direction of the drive element (10) is converted; one end of a drive shaft (6) is fixed to a first portion (21) of the conversion member (7); and the drive shaft (6) is fixed to the first portion (21) of the conversion member (7) such that one of the drive shaft (6) and the first portion (21) is fitted in a recessed portion that is provided in the other one of the drive shaft and the first portion.</p>
