To easily detect a center position of a hole part of a stacked cartridge, while securing necessary detection accuracy.

A hole position detection sensor 20 for detecting coordinates of end parts of the hole 2 of the cartridge 1 is mounted at the outside of a vertical piece 13n of one holding member 13 of a pair of holding members 13 and 14 provided on a distal end side of an arm part 12 of a handling device to detect coordinates of X direction end parts A and B and Y direction end parts C and D. From the coordinates of the end parts A, B, C and D, the coordinate of the center position O of the hole 2 is calculated.