A female connector (F) includes a retainer (30) to be housed into a mounting hole (14) and selectively mounted, in a housing (10), at a partial locking position for allowing insertion of terminal fittings (50) and a full locking position for locking already inserted terminal fittings (50). A base (33) is at a rear end of the retainer (30) in a mounting direction into the housing (10) and is located outside a mounting hole (14) when the retainer (30) is at the partial locking position. Backlash eliminating portions (21, 22, 41, 42) are formed on the base (33) and in the housing (10) and are configured to restrict a relative displacement of the retainer (30) with respect to the housing (10) when the retainer (30) is at the partial locking position.