US Patent 9431806 Waterproof box and electric junction box equipped with same

Provided is a waterproof box capable of increasing the amount of water discharged from a double wall without reducing the rigidity of a body case. A waterproof box is provided with a body case and an upper cover attached to the body case so as to cover an opening of the body case. A peripheral wall of the body case has a double-wall structure including an outer wall and an inner wall. Liquid penetrating from a seam between the upper cover and the outer wall passes between the outer wall and the inner wall and is discharged to the outside of the body case. A wide width portion and a narrow width portion which have mutually different gaps between the outer wall and the inner wall are formed in the body case.