| 摘要 |
A lock hole (22) in the form of a window is formed to penetrate a front end portion of a lock arm (15) resiliently displaceable like a seesaw. In a state where two housings (10, 50) are not connected yet, a movement of the detector (30) to a detection position is prevented by such engagement of a latching projection (39) with the lock hole (22) as not to move any further forward. A pair of reinforcing ribs (23) extending from the front end of the lock arm (15) to a position slightly behind inclination supporting legs (16) of the lock arm (15) and arranged at the opposite widthwise sides of the lock hole (22) are formed to project from the lock arm (15). The reinforcing ribs (23) increase the rigidity of the front end portion of the lock arm (15).
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