A joint connector comprises a plurality of terminals, a housing having a space with a size such that the plurality of terminals is capable of being accommodated in a contact state in parallel, and a terminal insertion slot allowing the terminals inserted into the space to be laterally moved from the side of one side wall to the opposite side wall, and a spring interposed between a terminal close to the one side wall among the plurality of terminals accommodated in the space, and the one side wall to press the plurality of terminals in a mutual contact state toward the opposite side wall.