Abstract: The present invention aims at providing a part mounting device for efficiently performing mounting operations by eliminating an amount of time required for moving and stoppage intended for recognizing an image of a part. In the part mounting device according to the present invention, an image recognizing device included in a working tower together with a mounting head comprises an optical fiber, a beam splitter arranged at the top of the optical fiber, and an image recognizing camera arranged at the top of the beam splitter. The image recognizing device further comprises an illumination light source at the side of the beam splitter. A nozzle shaft of the mounting head is arranged by being loosely inserted into a lower portion of the optical fiber. An irradiation light from the illumination light source irradiates a part which is picked up by the picking-up nozzle attached to the tip of the nozzle shaft via the beam splitter and the optical fiber.