Patent ID: 7521290

Claim:
A method of manufacturing a circuit device in which electric circuits each including conductive patterns and circuit elements are mounted on surfaces of circuit boards, and in which leads are fixed respectively to pads each made of the conductive pattern, the method comprising the steps of: preparing a substrate in which the plurality of the circuit boards are integrally connected to one another, each of the circuit boards having the conductive patterns which include the pads formed on the surface of the circuit board; electrically connecting the circuit elements to the respective conductive patterns on each of the circuit boards; positioning ends of the plurality of leads above the respective pads by superposing a lead frame including the leads on the substrate, and fixing the leads to the respective pads; and separating the circuit boards from the substrate in a state where the leads are fixed to the respective pad on each of the circuit boards, and separating the leads from the lead frame.