Electrical junction box

An electrical junction box configured such that an external member formed separately from a box body is mounted on the box body with fitting portions provided at a plurality of locations, wherein:

• as one set of the fitting portions provided at the plurality of locations, lock portions for being engaged with each other are formed in the box body and the external member, respectively;
• as one set of the fitting portions provided at the plurality of locations, an engaging guide rib is formed in one of the box body and the external member, the engaging guide rib protruding from a wall surface of the box body or the external member so as to extend in a direction in which the external member is fitted to the box body and including locking portions that extend in opposite directions orthogonal to a direction of extension of the engaging guide rib, and an engaging guide groove for being engaged with the engaging guide rib is formed in the other of the box body and the external member;
• and
• the lock portions are engaged after the engaging guide rib and the engaging guide groove are engaged.