VARIABLE RESISTOR

PROBLEM TO BE SOLVED: To increase contact pressure between a contact part and a resistor, reduce variations of a support point which supports an arm part and to simplify the work by forming a protruded piece on the side of a dished protrusion through cutting and lifting up up or cutting off, and by supporting the midpoint between the contact and a coupling part of the arm in contact with the underside of the protruded piece. SOLUTION: Protruded pieces 11c are formed on the side of a dished protrusion 11b of a slider, at least at positions symmetrical by 180 degrees. The dished protrusion 11b is inserted into an arm 12, by folding the arm 12 at a coupling part 13 by 180 degrees. Four protruded pieces 11c are formed with spacing of 90 degrees on the side of the dished protrusion 11b, and a midpoint 12c between the contact 12a of the arm 12 and the coupling part 13 is supported in contact with the underside of the two opposed protruded pieces 11c. The four protruded pieces 11c are formed by drawing the dished protrusion 11b and downwardly cutting it off from the flange 11a up to the dished protrusion 11b. The protruded pieces 11c form the bottom of a screwdriver cross-shaped groove 11d.