PURPOSE: To reduce the number of screws used and improve the convenience for use of a receiving cabinet and the attractiveness of the inside of the receiving cabinet while operations such as drilling are reduced, by using screws and screw inserting holes both for sticking attachment member mounting fittings for mounting attachment members like doors and connecting the receiving cabinets with each other when a plurality of receiving cabinets are interconnected.

CONSTITUTION: A connecting sleeve 8 having an internal thread 81 is inserted into through holes 13, 23 provided in adjacent side plate 11, 21 of receiving cabinets 1, 2. A mounting hole 71 in an attachment member mounting fittings 7 for mounting a door, through holes 13, 23 are set in alignment with each other to put the attachment member mounting fittings 7 on the receiving cabinets 1, 2 and a fixing screw 9 is inserted from above the fitting to engage threadingly the internal screw 81 in the connecting sleeve 8.