PURPOSE: A lead pin is provided to prevent the contamination by restricting the movement of a solder paste to the lead pin direction. CONSTITUTION: A connection pin(110) is inserted to a hole. A head unit(120) is formed on one end of the connection pin. A movement prevention unit prevents the paste from moving to the connection pin direction. The movement prevention unit comprises a concave unit on the upper part of the head unit. The concave unit comprises a vertical part which is placed in parallel with the connection pin and a horizontal part which is combined with the vertical part as one body.
