To provide a feeder heightened in feed screw supporting rigidity.

A feeder for driving a driven body 9 along a guide part provided at a feeder body 1 is provided with a screw shaft 6 rotatably supported at one end and the other end respectively to a first support 4 and a second support part 5 provided at the feeder body 1, and provided on its outer peripheral surface with a first thread groove 11 and a second thread groove 12 of different pitch from the first thread groove 11 thread-fastened to the driven body 9; a driving motor 8 rotatory-driving the screw shaft to move the driven body 9 along the guide part; and support members 16a, 16b thread-fastened to the second thread groove 12 of the screw shaft 6 and slid along the feeder body while supporting the screw shaft 6 by rotatory-driving the screw shaft 6.