An object of the present invention is to provide a method of manufacturing a hybrid integrated circuit device, in which multiple circuit boards are manufactured from one large metal board by dicing. The hybrid integrated circuit device of the present invention includes a circuit board with a surface provided with an insulating layer, and conductive patterns provided on the insulating layer. Circuit elements are electrically connected to the conductive patterns. Further, each side surface of the circuit board includes a first inclined portion extending obliquely downward from a peripheral portion of the surface of the circuit board, and a second inclined portion extending obliquely upward from a back surface of the circuit board and formed to be larger than the first inclined portion.