The connector housing has a terminal accommodating chamber block made up of a plurality of terminal accommodating chambers that are separated from each other by walls and that open in directions crossing the axial direction of the block. The terminal locking device fitted over the terminal accommodating chamber block is advanced in two steps, first into a preliminary-engagement state and then into a full-engagement state with respect to the connector housing. The terminal locking device has resilient deflecting plates which have terminal locking projections formed on the inner side thereof that protrude through the openings into the terminal accommodating chambers. In the preliminary-engagement state, the resilient deflecting plates ride on tapered projections formed on the outer wall surfaces of the terminal accommodating chamber block, holding the terminal locking projections out of a terminal lug insertion path in the terminal accommodating chambers. This allows the terminal lug to be pulled out easily from the connector.