An electrical junction box configured to stably hold a cover member in a standby state in a first position apart from a connector-mounting section. The electrical junction box includes a cover member rotatably attached to a casing about rotary support axes, an engaging projection provided on the casing that engages the cover member to position the cover member in the first position, a guide projection provided on one of the casing and the cover member, and a pair of positioning walls provided on the other of the casing and the cover member, wherein the cover member is positioned with respect to the engaging projection in an axial direction of the rotary support axes when the pair of positioning wall portions pinch the guide projection.