SPRING MANUFACTURING METHOD AND SPRING

Provided is a spring manufacturing method wherein the stress distribution of the spring when a load is applied is confirmed. This manufacturing method for a spring (1) includes a step for applying a load to the spring (1), a step for measuring the stress on the spring to which the load has been applied, and a step for releasing the load applied to the spring (1). The measurement of the stress on the spring (1) may include a step in which stress on the surface of the effective section of the spring (1) is measured using X-ray diffraction by a cos[alpha] method and a determination is made regarding whether the magnitude of the measured stress on the spring (1) satisfies a standard. 本发明提供一种对负载有载荷的弹簧的应力分布进行确认的弹簧的制造方法。弹簧(1)的制造方法包括：对弹簧(1)负载载荷的工序；对负载有载荷的弹簧的应力进行测定的工序；以及释放对弹簧(1)负载的载荷的工序，弹簧(1)的应力的测定还可以包括：使用基于cosα法的X射线衍射来测定弹簧(1)的有效部的表面的应力，并对测定出的弹簧(1)的应力的大小是否满足基准进行判定的工序。