PURPOSE: To provide a forming method of an engaging member which engages elemental parts having uniformity with high accuracy and enables mass production easily in formation of the engaging member of a thin steel sheet.

CONSTITUTION: A punch 17 is brought into contact with the surface of a thin steel sheet 11 and by pressing the punch 17 into the thin steel sheet 11 in a thickness direction the engaging member 14 which engages elemental parts such as a carrier tape and a spring is integrally protruded to be formed from the other surface of the thin steel sheet 11 and, at the same time, the engaging member 14 is slant while having the inclination 18.