A striker for a locking device which is mounted either a main body or an opening and closing member such as a door or hood in an automobile by tightening bolts passing through bores of the mounting portions in a base plate and is adapted for engagement with a latch to restrict movements of the member. A thin steel or other metal plate is used to form the base plate lighten weight of the striker, and outer periphery of the bore is formed to rise at an angle within 90 to receive tightening force exerted through bearing surface of the bolt as compressive load without causing deformation of the mounting portion.