A harness-side connector (30) to be connected to a board connector (10) whose metal fixtures (20) are fixed to the upper surface of a board (P) by soldering include a female housing (31) connected to an end of a wiring harness and fittable into a receptacle (12) of the board connector (10) and a holder (50) formed separately from the female housing (31). The holder (50) includes lock arms (57A, 57B) which are resiliently engaged with the female housing (31) to lock the holder (5) in a state mounted on the female housing (31) and a locking portion (61) which is engaged with the lower surface of the board (P) when the female housing (31) is fitted into the receptacle (12) of the board connector (10) after the holder (50) is mounted on the female housing (31).