To provide an actuator for an antiskid control device to prevent water drops from reaching the internal seal member of a valve containing hole.

Formation of an actuator for an antiskid control device is such that a valve containing hole 2 is opened to one side 1a of a housing 1 and a solenoid valve 3 is contained in the valve containing hole 2 in such a state to protrude at 3a from the housing 1, the protrusion part 3a of the solenoid valve 3 is covered with a cover 4 attached to the housing 1, a solenoid valve containing chamber 5 comprises the cover 4; and a housing 1, the shaft part 7a of a bolt 7 is extended through a press plate 6 to press the protrusion part 3a of the solenoid valve 3, and a collar 11 is inserted in the shaft part 7a, a bolt 7 is joined in a screwed-in state with the housing 1, the collar 11 is located between the press plate 6 and the housing 1, and the solenoid valve 3 is mounted in play on the housing 1. A sheet-form seal member 8 is located between the solenoid valve 3 and one side 1a of the housing 1 to seal the opening part of the valve containing hole 2.