PURPOSE: To obtain a lead frame wherein plating metal does not attach on the tip side surface of an inner lead, by a method wherein, after a lead frame is wrought and plated, release agent is brought into contact with the lead frame in the state that a region to be plated is coated, and a plated layer attaching on the unnecessary part is exfoliated and eliminated.

CONSTITUTION: By a stamping method, belt type material is wrought and molded in the shape of an ordinary lead frame including inner leads 4 facing a die pad 2, outer leads 8, a tie bar 7, etc. Through a coining process, a flat width of an inner lead tip is ensured and then the tip part is plated M. A lead frame wherein shaping and plating are finished in this manner is mounted on a plated layer releasing equipment, and the plated layers on unnecessary parts are exfoliated and eliminated. Said releasing equipment uses an electrolytic method; electric charges are generated by bringing an anode contactor 19 into contact with the lead frame; releasing liquid is sprayed via a cathode electrode 14; the negatively charged releasing liquid is supplied on the non-plated surface side of the lead frame.