Provided is an electrical junction box which can easily attach a block to an inner side of a frame without the need for visual positioning of a lock portion of the block and a lock receive portion of the frame. An electrical junction box includes a frame and a block to be attached to an inner side of the frame. The block includes a lock portion, and the frame includes a lock receive portion to which the lock portion engages. Four faces of the frame arranged to surround the block include a tapered face for guiding the block to a proper attachment position. The frame includes a double wall including an outer wall and an inner wall, and a rib connecting the outer wall and the inner wall. The rib is extended above the inner wall, and the tapered face is provided to an extended portion of the rib.