To provide a lock device of a gate door, facilitating operation, having certainty, and achieving firm engagement of a latch and a latch receiver not to cause looseness.

In a gate door, a door is rotatably disposed on a support, and the lock device includes the latch and the latch receiver. In the lock device provided between two gate doors 1, 2, one gate door 2 is provided with the latch 6 freely elevated and turned in the horizontal direction, both gate doors 1, 2 are provided with latch receivers 5, 5, the upper part and the side parts of which are opened, and the latch 6 is elevated and turned to engage with or disengage from the latch receivers 5, 5.

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