The present invention relates to a screw feeder, the conventional screw feeder does not use a long screw length of a non-determined standard, there was a problem that the contact portion is easily damaged as the contact portion of the screw feeder repeatedly touches the fastening portion.;Therefore, the present invention is formed in the guide groove 111 on both sides of the contact portion 110 of the screw feeder 100, the fitting groove 112 is formed on both sides of the upper surface, maintaining the interval to be fitted to the guide groove 111 The sphere 200 has grooves 210 at regular intervals formed on both bottom surfaces thereof, and an operation member 300 fitted into the fitting groove 112 of the contact portion 110 has a catching portion 310 formed at a lower end thereof. And a pressing part 320 is formed at an upper end, and an elastic member 400 is installed between the pressing part 320 of the operating member 300 and the upper surface of the contacting part 110, thereby contacting the screw feeder 100. Since the surface portion 110 is not directly in contact with the fastening portion and the gap with the fastening portion can be adjusted by the spacing retainer 200, it is possible to prevent the damage of the contact portion 110, depending on the length of the screw applied It can be used by adjusting the extension length of the gap retaining hole 200 from the contact surface (110) Functionality can be further improved.
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