To provide a door lock in which a timing of reverse rotation of a latch head can be controlled with a simple structure.

The latch head 5, having an engaging surface 2 engaged with a strike 1 on the side of the door frame and an adjacent surface 3 intersecting with the engaging surface 2, is urged in a direction of its projection from a lock case 4. The latch head 5 may be moved rotationally between a door restraint position and a door nonrestraint position of the engaging surface 2. The surface 2 in the restraint position keeps the door closed, while generally facing a surface orthogonal to an open-door directional line (DL). The surface 2 in the nonrestraint position causes a retraction force component into the case 4 when operation of opening the door, while intersecting at a predetermined angle to the surface orthogonal to the directional line (DL). The door lock allows or restrains the rotation of the head 5 toward the nonrestraint position by engaging or disengaging an engaging lever 7 with or from engaging projections 6 formed on the head 5. The head 5 is provided with the two projections 6. The lever 7 which may be released by a door operating member 8 is engageable with one of the projections. The lever 7 which interlocks with a dead bolt 9 coming out from and going into the case 4 is engageable with the other projection.