An electrical junction box for a motor vehicle, the electrical junction box including a casing assembly, a bracket section and a bracket. The bracket section is integrated with and projected from an exterior of the casing assembly. The bracket section includes a top wall provided with a clip-engaging hole and opposite side walls extending downward from the top wall and that have clamping-piece portions that are opposed to each other at a distal end of the opposite side walls. The bracket is fitted on and secured to an exterior of the bracket section. The bracket includes a top plate portion provided with a clip-engaging hole and an outer plate portion extending downward from the top plate portion and that has an engaging-piece portion.