To improve an effect for preventing backflow from a water tank while maintaining smoothness in the inflow of water to the water tank with wiping operation concerning a bedewing wiper with a water tank.

Inside a handle part 4, a water tank 26 is formed for storing bedewing water wiped by a wiping part 2 and at the wiping part 2, a wiper blade 12 is supported on the fore side of a convergent water leading part 14 and at the terminal edge of a lower part. The convergent water leading part 14 is gradually converged backward and the rear terminal part is linked with the fore terminal part of the handle part 4. For the convergent water leading part 14, an backflow preventing part for guiding water from the wiper blade 12 to the water tank 26 and for preventing water backflow is formed. This backflow preventing part has a lower backflow preventing plate 16 extended upward from the lower side of pipe-shaped section of the convergent water leading part 14 and a water hole 17 formed above that plate while letting its one part at least reach the inner wall of pipe-shaped section of the convergent water leading part 14.