To prevent falling of a head end part of a blade at the time of wiping a curved surface type window surface by the wiper blade.

A second lever 4 to be connected to a head end part of a first lever 3 constituting the wiper blade is divided into a head end lever 4b and a base end lever 4c, the head end lever 4b is connected to a head end of the base end lever 4c free to revolve around lever length, an arm 8 for form changing projected to the side is projectively provided on a side surface in the upper reversing direction side of the head end lever 4b, and the head end part of the arm 8 for form changing is connected to a support piece part 9b projectively provided on a fin 9 integrally provided on the first lever 3 free to oscillate in the three-dimensional direction through a ball joint 8a.