A joint connector capable of mutually short-circuiting wires reliably without an increase in the number of components and size thereof. The joint connector (JC) comprises a joint terminal for short-circuiting and a connector housing. The joint terminal includes a plurality of electric contact portions and a short-circuiting portion connecting the electric contact portions. The connector housing has a bottom wall and other walls surrounding a terminal insertion space into which each of the wire-side terminal is inserted, and a lance for locking the inserted wire-side terminal. The lance adapted to be deflected so as to project outwardly from the bottom wall, until the wire-side terminal reaches a proper insertion depth position, to be retracted from the wire-side terminal, and elastically return into the bottom wall, when the wire-side terminal reaches the position. The deflection of the lance allows the insertion of the wire-side terminal to be checked.