To compensate for tolerance and shifting among a hydraulic block, a power motor and a controller by forming a contact means in the connecting part of the electric motor, to be flexible in the attaching direction of the controller.

A power motor 3 having two connecting parts 7 is provided in the side face 5 of a hydraulic block 2 and a controller 4 is provided in a side face 6 in parallel with the same. The connecting parts 7 connect the side faces 5 and 6 to each other. A through-hole 13 is formed in the hydraulic block 2. In the portion 10 of a plastic injection molding 9 surrounding each connecting part 7, a clip-like elastic contact means 14 is formed. Also, in the contact surface 23 of the controller 4, the free leg end 24 of the second leg part 17 of the contact means 14 of the power motor 3 is caused to function by applying a preload. Thus, tolerance among the hydraulic block 2, the power motor 3 and the controller 4 is compensated for in an attaching direction and its horizontal direction.