Lead frame and manufacturing method of lead frame insert molded article

A manufacturing method of a lead frame insert molded article in which a lead frame is integrated with a resin case having a bottomed cylindrical shape through insert molding, so that a first terminal part and a second terminal part protrude in a cylinder axial direction from a bottom part of the resin case, the lead frame comprising:

• a first frame, integrally formed with the first terminal part;
• a second frame, integrally formed with the second terminal part extending in a direction same as the first terminal part;
• and a fixed contact piece, integrally formed with the first frame via a conductive connection part, and having a protrusion part which extends in the direction same as the first terminal part and the second terminal part and in which a tip end part is integrally formed with the first terminal part and the second terminal part via a connection part, the manufacturing method of the lead frame insert molded article comprising:
• a pressing process of forming the lead frame from a conductive plate;
• a first cutting process of cutting off the conductive connection part in the lead frame formed in the pressing process;
• a mounting process of mounting resistance elements to the lead frame;
• a resin sealing process of resin sealing the resistance elements mounted in the mounting process together with the first frame and the second frame and the fixed contact piece by insert molding while positioning the lead frame on a side of the first terminal part and the second terminal part, and molding the resin case so that the first terminal part and the second terminal part and the tip end part of the protrusion part protrude from the bottom part;
• and
• a second cutting process of cutting off the connection part to separate the tip end part of the protrusion part from the first terminal part and the second terminal part.