Vehicle lamp washer system and nozzle cover

In a vehicle lamp washer system, a piston (3) is supported in a cylinder (2) so as to move in an axial direction. A valve case (4) has jet nozzles (29) from which the washer fluid is jetted and is connected to one end portion of the piston (3). The piston (3) has a first flow path through which the washer fluid flows. The valve case (4) has a second flow path connected to the first flow path, third flow paths branching off the second flow path and communicating with the jet nozzles (29), and a branch portion at which the second flow path and the third flow paths are connected together. A valve (24) moves in accordance with a fluid pressure of the washer fluid to open or close the branch portion so as to start or stop a supply of the washer fluid from the second flow path to the third flow paths.