A nozzle portion having jet nozzles for jetting a cleaning liquid, a nozzle cover covering the nozzle portion from a front side, a piston connected to the nozzle portion, and moved integrally with the nozzle portion and the nozzle cover in a movement direction, and a cylinder movably supporting the piston are provided. A bracket which includes arms located in abutment with or in proximity with a rear surface of the nozzle cover and regulates an inclination of the nozzle cover with respect to the movement direction is provided.