The invention provides a method for producing timepiece springs, a device for producing timepiece springs, the timepiece spring, and a timepiece. The method for producing the timepiece spring is characterized in that the method for producing the timepiece spring includes a step for producing, by casting, a metallic glass raw material constituted of a metallic glass; a step for heating the metallic glass raw material to achieve a superplastic state; and a step for rolling the metallic glass raw material in a superplastic state to produce a sheet material. A timepiece spring is characterized by being obtained by the method for producing a timepiece spring.