A lead-mounting seat includes a conductive seat body including a lead-mounting plate and spaced apart first and second insert legs that extend from the lead-mounting plate and that have different geometric shapes. The lead-mounting plate is formed with a plurality of lead-mounting holes. Each of the first and second insert legs has a connecting end connected to the lead-mounting plate, and a free end opposite to the connecting end. Each of the first and second insert legs is reduced in width from the connecting end to the free end.