Electronic control device has case, circuit board and cover. Case bottom wall section has insertion guide rising up from top surface thereof. Insertion guide has guide hole in top section wall, through which terminal of solenoid coil is inserted, and guide groove surrounding at least three sides of terminal is formed to be continuous with guide hole. Terminal is inserted into insertion hole through guide groove from the bottom section of insertion guide, is guided to guide hole by guide groove, and projects from insertion guide through guide hole. Top section wall and circuit board are adjacent, and through hole is disposed directly above guide hole, thereby terminal projecting from insertion guide is guided to and inserted into through hole.