To achieve efficient caulking by completely preventing generation of caulking breakage (processing crack) such as a crack, etc., at the time of caulking of a spring material (a base material) of an electric contact.

An upstand part 21 is provided on a lower part of a contact head part 1, and a construction part 8 is formed on the top of an upper contact, so that transition of a work strain curve at the time of caulking is smooth without generating an acute angle part and that a phenomenon of caulking breakage (processing crack) such as generation of a crack, etc., is prevented. Specifically, by completely preventing generation of caulking breakage (processing crack) such as a crack, etc., at the time of caulking of the spring material (the base material) of the electric contact, manufacturing yield is improved and reduction of costs can be achieved.