PURPOSE: To prevent a device or parts from being scattered, to show a fastening procedure of a bolt, and also to make positioning reliably.

CONSTITUTION: Attaching metal fitting adaptable for an attaching part 2 and a device unit attached to the attaching part is provided and attached. The metal fitting is composed of a soft latch 7 composed of a temporarily fixing pin 12 and a temporary fixing pin restricting part 7 into which the pin is to be inserted, guide pin mechanisms 8, 11 composed of guide pins 20, 31 and guide pin restricting parts 8a, 11a into which the guide pins are to be inserted, and a nut mechanisms 9, 10 composed of bolts 23, 27 and collar provided nut parts 9a, 10a provided with threaded holes to be screwed to the bolts 23, 27.