A control device for a mobile body, the control device comprising: a plurality of sensors (10 - 18)that acquire information including an external environment of the mobile body; and an arithmetic unit that controls onboard devices of the mobile body in response to the information input from the plurality of sensors (10 - 18), wherein the arithmetic unit includes: a first functional section that is actuated regardless of a status of the mobile body and generates a control signal to one or more of the onboard devices; second functional sections (21 - 24) that are each actuated in accordance with the status of the mobile body and each generate a control signal to the onboard devices other than the one or more onboard devices; power transmitters (41 - 44) disposed in a power transmission path between a power source and the respective second functional sections (21 - 24); and a power source controller that outputs a control signal to the respective power transmitters (41 - 44) in accordance with the status of the mobile body identified based on the information input from the sensors, to control supply and cutoff of power to the second functional sections (21 - 24), characterized in that the first functional section and the power source controller are mounted on a single chip configured as an integrated circuit. a plurality of sensors (10 - 18)that acquire information including an external environment of the mobile body; and an arithmetic unit that controls onboard devices of the mobile body in response to the information input from the plurality of sensors (10 - 18), wherein the arithmetic unit includes: a first functional section that is actuated regardless of a status of the mobile body and generates a control signal to one or more of the onboard devices; second functional sections (21 - 24) that are each actuated in accordance with the status of the mobile body and each generate a control signal to the onboard devices other than the one or more onboard devices; power transmitters (41 - 44) disposed in a power transmission path between a power source and the respective second functional sections (21 - 24); and a power source controller that outputs a control signal to the respective power transmitters (41 - 44) in accordance with the status of the mobile body identified based on the information input from the sensors, to control supply and cutoff of power to the second functional sections (21 - 24), characterized in that the first functional section and the power source controller are mounted on a single chip configured as an integrated circuit. a first functional section that is actuated regardless of a status of the mobile body and generates a control signal to one or more of the onboard devices; second functional sections (21 - 24) that are each actuated in accordance with the status of the mobile body and each generate a control signal to the onboard devices other than the one or more onboard devices; power transmitters (41 - 44) disposed in a power transmission path between a power source and the respective second functional sections (21 - 24); and a power source controller that outputs a control signal to the respective power transmitters (41 - 44) in accordance with the status of the mobile body identified based on the information input from the sensors, to control supply and cutoff of power to the second functional sections (21 - 24), characterized in that the first functional section and the power source controller are mounted on a single chip configured as an integrated circuit.