Button fastener-side die for attaching snap button

A button fastener-side die for attaching a snap button, on which a button fastener is to be set when a snap member is attached to a fabric with the button fastener, the button fastener comprising an annular base defining an opening and a plurality of legs extending from the base, the button fastener-side die comprising:

• a holding part for holding the button fastener, an elongated columnar correcting member for passing through the opening of the base of the button fastener held by the holding part, an elongated columnar pushing member for pushing the elongated columnar correcting member to move in a passing direction toward passing through the opening of the base of the button fastener, a first spring disposed between a lower end surface of the elongated columnar correcting member and an upper end surface of the elongated columnar pushing member and arranged to move in the passing direction by the elongated columnar pushing member, and a gap between the lower end surface of the elongated columnar correcting member and the upper end surface of the elongated columnar pushing member,
• wherein the elongated columnar correcting member, the elongated columnar pushing member, and the first spring have a common axis which is parallel to the passing direction,
• wherein (i) when at least one of the legs of the button fastener is in an abnormal position bent radially inward from a normal position, the first spring is temporarily compressed and the gap is temporarily reduced from their initial states as the elongated columnar correcting member corrects the leg(s) in the abnormal position to be in the normal position as the elongated columnar correcting member is passing through the opening of the button fastener, (ii) when the legs of the button fastener are not in the abnormal position, the first spring and the gap are substantially kept in their initial states.