To provide a relay connector which can be fixed and removed easily.

A locking head holding part 2b having a recessed part 2b-1 at its tip part is formed at a lower part of a relay connector 1. One end of a locking head 6 having a screw groove at its outer periphery is inserted into the recessed part 2b-1 of the locking head holding part 2b with pressure. In case of fixing the relay connector 1, the relay connector can be fixed easily by preparing a screw hole corresponding to the screw groove of the locking head 6, and screwing the locking head into the screw hole. When the relay terminal becomes unnecessary, the relay terminal can be removed easily by reversely turning the locking head.