PURPOSE: To suppress both the width and height of a circuit board housing case with connector to minimum dimensions by setting a female-side housing provided in the reversed direction of the circuit board in the wall part of a box case body with it being partially recessed therein.

CONSTITUTION: A circuit board 2 having a mounting IC part 1 on board is housed on one surface of a box case body 4, and a female-side connector 5 is provided on the other surface in such a manner that the connecting direction with a partner connector is parallel to the circuit board 2. The female-side connector 5 is recessed in the outer circumferential wall part 8 of the box case body 4. According to this constitution, the height dimension is never increased for a male-side partner connector, the height of the box case body can be reduced by the amount of recessing the female-side housing in the wall part 8 of the box case body 4, and both the width and height can be suppressed to minimum dimensions.