A drive device includes: a cover that is installed to an outer wall of a housing; a control unit that is installed in an inside of the cover; a terminal that extends from the control unit and extends through the cover; and a lead wire that extends from a coil and extends through the housing and the cover. The lead wire is electrically connected to the terminal at an outside of the cover. Therefore, the lead wire and the terminal can be connected together after installation of the cover to the housing. At this time, a lead wire insertion hole is shielded by the cover, and thereby it is possible to limit intrusion of solder debris into an inside of the housing through the lead wire insertion hole.