A first pivot shaft 2a and a second pivot shaft 2b linked with wiper arms; a driving part, rotationally driving the first pivot shaft; a linking part, linked with the second pivot shaft and the driving part, and rotationally driving the two pivot shafts synchronously; and a first holding member 12a and a second holding member 12b for fixing the respective pivot shafts to a vehicle body are provided. The second holding member 12b includes: a body part 20, rotatably supporting the second pivot shaft 2b; and three support parts 21, 22, 23, protruding from the body part 20. The first support part 22 and the third support part 23 in the three support parts 21, 22, 23 include fixed parts 30 fixed via bolts 105 and engagement pins 38 provided in the fixed parts 30 and engaged with the vehicle body.