To provide a controlling device of a moving member of a loom, driven by an exclusive motor synchronized with the main shaft of the loom so as to be able to judge whether the starting point-searching movement is normally performed or not.

This controlling device equipped with a sensor 30 for detecting that a reed frame 11 as a moving member of the loom, driven by the exclusive motor different from a motor of the loom, is at a prescribed moving position, and a controlling device 33 while driving the exclusive motor 12, inputting a signal of the sensor 30 and determining the position for rotation of the exclusive motor 12 corresponding to a mechanical starting point of the reed frame 11 based on the signal on actuating the search for the starting point is provided with that the controlling device 33 compares any of the outputting period and non-outputting period of the signals of the sensor 30 in the actuating time of the starting point search with an allowable value set in advance and judges the success or failure of the starting point search.