To provide a gate door which can improve stability when it is used or stored.

A gate door fixing unit 20 consists of round-drop retaining hardware 21, an anchor 22, and separate round-drop receiver hardware 23. The round-drop retaining hardware 21 is fixed to the gate door 1, and the anchor 22 engaged with the round-drop retaining hardware 21 can be moved in the up-and-down direction. Then the separate round-drop receiver hardware 23 has a through hole and an insertion cylindrical part. The tip of the anchor 22 is inserted to and engaged with the through hole, and the insertion cylindrical part houses the tip of the anchor 22 and is used by being buried in the ground. When the gate door 1 is closed, the position of the gate door 1 is fixed by inserting and engaging the anchor 22 to the insertion cylindrical part.

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