PROBLEM TO BE SOLVED: To lessen a packing volume for a positioner, and facilitate the replacement work for a feedback lever, and improve the durability of a spring by making a fixed pressing force always act on a connecting pin provided in the working shaft of a valve, and accurately detect the operating rate of a working shaft. SOLUTION: A feedback lever 9 is composed of the first and the second lever 9A, 9B. The first lever 9A is attached to the rotary shaft of a sensor, and the second lever 9B is detachably attached to the first lever 9A. The second lever 9B is provided with a slot 13 and a round hole 54, and a connecting pin 12 provided on the working shaft of a valve is moved from the round hole 54 into the slot 13. The pressing part 14c of a pin pressing spring 14 which is attached to the second lever 9B and brings the connecting pin 12 into pressure contact with the one side wall 13a of the slot 13 is bent into a circular arc- shape.
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