Shaft member and method for manufacturing male shaft

A shaft member comprising:

• an outer peripheral surface;
• at least one axial side surface facing an axial direction;
• a chamfered portion formed at a connection portion between an axial end edge of the outer peripheral surface and an outer peripheral edge of the axial side surface;
• and
• a processing target portion formed on at least a part of the outer peripheral surface, wherein
• the chamfered portion includes at least one supported surface portion disposed at an axially intermediate portion of the chamfered portion and inclined radially outward as approaching the processing target portion in the axial direction,
• the axial end edge of the outer peripheral surface and the outer peripheral edge of the axial side surface are located radially inward than a tangent line at an axially intermediate portion of the supported surface portion, in a cross section in the axial direction,.
• the chamfered portion connects the axial end edge of the supported surface portion with the axial end edge of the outer peripheral surface or the outer peripheral edge of the axial side, and a connection inclined surface portion or step, and
• the connection inclined surface portion or the step portion absorbs the elongation of the shaft member when the supported surface portion is pressed in the radial direction.