An intermediate electrical connector 1 which, upon connection of a first counterpart connect body 2 and a second counterpart connect body each from different sides in a manner permitting plugging and unplugging, mediates between the two counterpart connect bodies, the intermediate electrical connector 1 comprising terminals that are enabled to contact, respectively, the first counterpart connect body 2 and the second counterpart connect body, and a housing that directly or indirectly secures the terminals in place, wherein the connector has locking fittings 100 supported by the housing of the intermediate electrical connector 1, and the locking fittings 100 have locking portions 104A enabled to engage lockable portions 151 provided in the first counterpart connect body 2 in the direction of disengagement when the intermediate electrical connector 1 and said first counterpart connect body 2 are connected.