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 (1) is provided with a body case (3) and an upper cover (2) attached to the body case (3) so as to cover an opening (30a) of the body case (3). A peripheral wall (39) of the body case (3) has a double-wall structure including an outer wall (31) and an inner wall (32). Liquid penetrating from a seam between the upper cover (2) and the outer wall (31) passes between the outer wall (31) and the inner wall (32) and is discharged to the outside of the body case (3). A wide width portion (6) and a narrow width portion (7) which have mutually different gaps between the outer wall (31) and the inner wall (32) are formed in the body case (3). Furthermore, the inner wall (32) has connection portions (8) bent outward from the ends of the wide width portion (6) and inward from the ends of the narrow width portion (7).