A laser marking apparatus includes a head marking the identifier on a mold, a light-shielding case, a light-shielding gate provided at either a carrying-in port or a carrying-out port of the light-shielding case, and a control unit controlling operation of the head and operation of the light-shielding gate, and the control unit closes the light-shielding gate and causes the head to start a marking operation on the mold in response to carrying-in of the mold into the operation space and opens the light-shielding gate in response to the marking operation ending.