Abstract: A door striker has an improved cross-sectional shape so that a latch can be maintained in close contact with the striker without back-and-forth clearance. In contrast, with conventional strikers, a door may make noise by being shaken due to application of external forces including changes in indoor and outdoor air pressure. Door strikers described herein include a latch assembly on a side surface of a door, which is connected to and operated by a handle member. A striker, to which a latch of the latch assembly is fitted, is installed on a door frame. The striker has a front latching protrusion for latching a front surface of the latch and a rear latching protrusion for latching a rear surface of the latch. The front latching protrusion has a right-angled surface of a front end thereof and an inclined surface the inside thereof.