To rotate a lever only in one direction, and to lock the rotation in the reverse direction, allowable to release, by energizing a release rod in the direction a blade is engaged to the ratchet of one side edge of the opening of a base bracket by a spring.

Since the teeth of the ratchet 14 of a base bracket 12 are formed upward obliquely, in a lever 11, a release rod 17 can be rotated in the direction of the arrow β (upward) as engaging its blade 16 to the ratchet 14. And when the lever 11 is the parking brake lever of an automobile, the parking brake is applied by rotating the lever 1 upward, that is by pulling up it. When the parking brake is released, the knob 18 of the lever is pushed to slide the release rod 17 in the reverse direction of the arrow α, and the engagement of the blade 16 of the release rod 17 and the ratchet 14 of the base bracket 12 is released.