WATERPROOF BOX

The present invention is to provide a waterproof box capable of improving waterproof performance and workability, and space-saving. When high-pressure washing is performed, washing water injected toward the waterproof box hits a peripheral wall of a box main body, and then washing water is increased along the peripheral wall. Since the increased washing water hits a lower surface of a first waterproof portion of a main body side waterproof structure, some force of the water is reduced. Furthermore, a part of the increase washing water passes through a space arranged inside of a wall upward.