A female housing (5) includes an inner tube (8) for accommodating female terminal fittings (14) and an outer tube (9) surrounding the outer peripheral surface of the inner tube (8). Cavities (15A, 15B) are arranged side by side in the female housing (5), extensions (E) project out in an arranging direction of the cavities from the cavities (15A) at ends in the arranging direction, and pushable surfaces (22) are at the rear ends of the extensions (E) for use during a connecting operation. Side walls (9B) of the outer tube (9) are continuous with the extensions (E), and operation recesses (44) are formed in the side walls (9B) before the extensions (E) in a connecting direction. Connecting and separating operations of the housings (1, 5) can be performed by gripping the operation recesses (44).