Provided is a circuit device in which an electronic circuit to be incorporated therein operates stably. A hybrid integrated circuit device includes multiple circuit boards which are disposed on approximately the same plane. An electronic circuit including a conductive pattern and a circuit element is formed on each top surface of the circuit boards. Furthermore, these circuit boards are integrally supported by a sealing resin. Moreover, a lead connected to the electronic circuit formed on the surface of the circuit board is led out from the sealing resin to the outside.