To make a cam body engage with a latch body in a door structure in which direct engagement of the cam body with the latch body is impossible.

When a lever handle 8 or 13 is operated to rotate in the given direction, door lock status shifts from the status shown in Fig.(A) to the status shown in Fig.(B). That is, the cam body 34 interlocked with lever handles 8 and 13 moves a main spring plate 36 in the direction indicated by the arrow in Fig.(B) against energizing force of a main spring 37. A yoke 38 receives thrust from the claw body 36a1 and 36a2 of the plate 36, and rotates around a shaft 44 which is inserted into the position located in the lower part of the center of the yoke 38. The latch body 39 is moved and settled in the case body 30 against energizing force of the latch body spring 41 by means of a pair of the arms 38b1 and 38b2.