In an electronic control device that includes two or more kinds of lead-insertion-type parts, including at least a coil (9) and a capacitor (8), the parts are installed on a support (1) that has a wiring (2), a terminal structure (3) and mechanically fixing portions (4); the leads of the above parts are respectively inserted in and electrically connected to holes (5) formed in the wiring portion of the support; the parts and the support are fixed to each other with an adhesion material (7) for fixation; the upper surfaces of the parts are attached to a metallic chasis (17) with a thermally conductive material (19) of a low elasticity modulus interposed in between; the mechanically fixing portions of the support are fixed to the metallic chasis; and the terminal structure of the support is electrically connected to a circuit board (14) that mounts at least a controlling element (15).