A board connector has a housing (11) with legs (16) on a lower surface (13) facing a surface side of a circuit board (30). A locking portion (21) is provided on a tip end of the leg (16) and protrudes in a direction intersecting with a projecting direction from the lower surface (13) and can be locked to an underside of the circuit board (30). A base end of the leg portion (16) is defined by a displacement allowing space (25) recessed in from the lower surface (13) of the housing (11).