To provide a pump liquid pressure damper structure in an antiskid control device, by which the manufacturing cost can be reduced without enlarging the whole device.

A small-diameter hole 17 is further formed on the bottom of a large-diameter hole 18 formed in a housing 1, a cylinder 41 for forming a pump unit 49 is screwed and fixed in the small-diameter hole 17, an opening part of the large-diameter hole 18 is blocked by a plug 19 to form a damping chamber with a designated capacity in the large-diameter hole 18 between the end surface of the cylinder 41 and the plug 19, the pump unit 40 comprises a capacity chamber 30 which is formed in the cylinder 41, and the capacity of which can be increased and decreased by the reciprocation of a plunger 42, and an inlet side non-return ball valve 33 and a discharge side check ball valve 29 disposed with the capacity chamber 30 interposed between them, and the discharge side check ball valve 29 is provided in a damping chamber 10 on the discharge side end surface of the cylinder 41.