An impact drive actuator comprises a vibrating base plate configured to be slightly displaced in a reciprocating manner by a vibrator in first and second directions, a first slider disposed on the vibrating base plate, a first electrode formed on the vibrating base plate, a second electrode so formed on the first slider as to face the first electrode through an insulation film, and a potential difference generator configured to generate a potential difference between the first and second electrodes to allow a first electrostatic attractive force to act between the vibrating base plate and first slider. When the vibrator reciprocates the vibrating base plate, the time needed to displace the vibrating base plate in the first direction is different from that in the second direction. The first slider is displaced relative to the vibrating base plate in the direction where the time needed for displacement is larger.