To provide a window glass cleaner enabling safe and efficient cleaning of a window glass, particularly of its outer face.

The device to be used for cleaning the window glass has a first shaft portion 11, a second shaft portion 12, and a bridge portion 13 for connecting these at their base ends. It comprises an approximately U-shaped handle part 1 constructed so that the first shaft portion 11 is located outside the window glass and at the same time the second shaft portion 12 is located inside the window glass, a wiping part 2 provided on the handle portion 1 at the end of the first shaft portion 11, a washing liquid spray nozzle part 3 provided adjacent to the wiping part 2 on the handle portion 1 at the end of the first shaft 11, and a washing liquid supply mechanism part 4 for supplying a washing liquid to the washing liquid spray nozzle part 3.