Provided is a resistor for controlling a fan motor rotating speed for use in an air conditioner. The resistor comprises a base body, a radiator attached to a top portion of the base body, a printed resistor circuit board covered with insulating sheets and received within the radiator, a fixture plate placed on a front surface of the radiator to isolate the printed resistor circuit board from the outside, and a temperature fuse spot-welded to upper connecting tip ends of the printed resistor circuit board at a top portion of the radiator. A fastener portion of an arc shape is formed on a top portion of the fixture plate to wrap around and fixedly support the temperature fuse. This reduces the manufacturing cost of the resistor, while improving the manufacturability and reliability thereof.