Electrical junction box

Abstract

An electrical junction box includes a casing body and a lower cover to be attached to the casing body. Slant portions are provided on lower and upper end edges of opposite side walls of the casing body and lower cover. The slant portions extending downward from a first side to a second side. A double wall structure including an outer peripheral wall and an inner peripheral wall is formed on the casing body along the lower end edges including the slant portions of the casing body. A distal end of the inner peripheral wall projects over that of the outer peripheral wall. The inner peripheral wall is provided on the projecting-over section with guide ribs protruding toward the outer peripheral wall. An engaging rib that contacts a lower end of the outer peripheral wall is provided on upper end edges on opposite side walls of the lower cover. The upper end edges of the lower cover are opposed to the lower end edges on opposite sides of the casing body. A protrusion piece projects from the engaging rib to be inserted into a clearance between the inner and outer peripheral walls of the casing body. The protrusion piece is guided and inserted into the clearance between the inner and outer peripheral walls by the guide ribs. With such a structure, workability of assembling a casing body and a lower cover can be enhanced, while maintaining a high waterproof function of the box by improving a fitting structure of the casing body and lower cover.