To eliminate such work as program setting and managing a sucking nozzle, for improved safety and productivity by discriminating the kind of sucking nozzle which is stored at each position of a nozzle stocker, and based on the discriminating result, taking the sucking nozzle out of the nozzle stocker.

A controlling device, prior to part-mounting operation, sequentially transports a CCD camera 23 onto storing parts 21a-21g, and image pickups the kinds information A-G of a sucking nozzle 16. Then, based on the imaging data and storing position data, it is discriminated which kinds of sucking nozzle 16 is stored in the storing parts 21a-21g. The controlling device, based on the discriminating result and mounting program data, drive-controls an XY robot, to transport multiple head parts, in the order stated in the mounting program data, on to a specified storing parts 21a-21g, for lowering and raising. Thereby, a nozzle main body 16a is pressed into a holder, and the sucking nozzle 16 of a specified kind is attached to the holder for taking out.