A cleaner includes a high-pressure air generation unit and a nozzle. The high-pressure air generation unit includes a cylinder, a piston supported to the cylinder to be freely moveable and deliver the high-pressure air toward the nozzle, an urging spring urges the piston, and a movement mechanism which moves the piston to a predetermined position. The movement mechanism comprises a worm which rotate by a driving unit, and a worm wheel meshed with the worm and which rotate in association with rotation of the worm. The worm wheel comprises a pinion having gear teeth protruding from an outer periphery thereof. The piston is coupled with a rack having rack teeth which mesh with the gear teeth, and wherein an interval between each gear tooth of the gear teeth and one adjacent gear tooth is different from an interval between each gear tooth and the other adjacent gear tooth.