Shaft element and manufacturing method of the shaft element

摘要

A shaft member of one embodiment includes: a base material that has a wave shape and is made of steel; a low-phosphorus plating layer which is laminated on the base material including phosphorus and in which the phosphorus content is 4.5% by weight or less; and a base plating layer formed as a nickel-phosphorus electrolytic plating layer or a high phosphorus plating layer laminated between the base material and the low phosphorus plating layer. It is therefore possible to increase the strength of the shaft member and to reduce the size of the shaft member.