PURPOSE: To improve the forming accuracy of a coil and the efficiency of production by feeding a wire rod according to the pulse signal corresponding to the oscillating rate of an oscillating body which drives a pitch changer for the part of the effective number of turn and a forming device for an end part, etc.

CONSTITUTION: The oscillating rate of a connecting body 10 which drives ≥1 device among a pitch changer for the part of the effective number of turn, a forming device for an end part, a cross sectional shape changer for the part of the number of effective turn and a cutter for a wire rod is converted to a pulse signal which is then measured. A DC servocontrol motor is driven by such pulse signal, by which a feed roller is driven to feed the wire rod for forming the part of the total number of turn of a coil spring to a coiling part. Said body 10 is connected to an oscillating body 4. The body 4 is oscillated by a cam or crank 2. The cam or crank 2 is driven by a driving shaft 1 which revolves at a constant speed.