In-Vehicle Control Device and Manufacturing Method

Provided is an in-vehicle control device () including: a base (); a cover () fixed to the base; a circuit board () housed in the base and the cover; and an electronic component () mounted on the circuit board, in which the base is made of a steel plate material, and includes a plate-shaped main body portion (), a bottomed cylinder () having a U-shaped cross section in which one of front and back surfaces of the main body portion is recessed and protrudes to the other side, and a screw portion () provided on a peripheral surface of the cylinder, and the circuit board is fastened to the base by a fastening member () screwed into the screw portion of the cylinder.