To increase the attachment rigidity of a wiper blade, and to improve the wiping performance, without deteriorating the attaching/detaching performance of the wiper blade to a wiper arm.

A wiper arm 13a is oscillatably provided on a vehicle body, and a wiper blade 14a reciprocatingly oscillated by the wiper arm 13a is attachably/detachably provided on the wiper arm 13a. At a tip end of the wiper arm 13a, a retainer tip end portion 22 is provided for holding the wiper blade 14a, and an arm attachment portion 23 engaged with the retainer tip end portion 22 is provided in a center of the wiper blade 14a. In the retainer tip end portion 22, holding walls 32a and 32b are provided which are brought into contact with a side face of the arm attachment portion 23 to hold the arm attachment portion 23 when the retainer tip end portion 22 and the arm attachment portion 23 are engaged with each other. The holding walls 32a and 32b pinch the arm attachment portion 23, thereby increasing the attachment rigidity of the wiper blade 14a and improving the wiping performance.