A power supply control device comprising: a mode switching controller (12, 200) that is configured to switch to one of at least an ordinary mode, in which power is received from a commercial power source and the power is the maximum supply capacity, and a first sleep mode, in which a lower power than in the ordinary mode is the supply capacity, and a second sleep mode in which power consumption is less than that of the first sleep mode; a first power supply section that is configured to supply power to a specific control system during the ordinary mode, and to continue to supply power to the specific control system during the first sleep mode; a second power supply section that is configured to supply power to components other than the specific control system during the ordinary mode, and to shut off a supply of power during the first sleep mode; a third power supply section that is connected to the second power supply section and a solar panel and that comprises an electricity storage device to be charged by the second power supply section and the solar panel, wherein the third power supply section is configured, during the first sleep mode, to supply power to the specific control system; a wiring system opening and closing unit that is provided at a downstream side relative to a power switch that shuts off the power supply of the commercial power source, the wiring system opening and closing unit being configured to set a power supply wiring system of the commercial power source to an open state or a closed state without regard to whether the power switch is on or off; the first power supply section and the second power supply section receiving power from the commercial power source via the wiring system opening and closing unit; and a controller (12, 56) that is configured, when the third power supply section is supplying power to the specific control system during the first sleep mode, and when it has been determined that a charging amount of the electricity storage device is sufficient for maintaining a sleep mode with a power which is supplied only from the electricity storage device while shutting down the commercial power source, to control the wiring system opening and closing unit and to set the power supply wiring system of the commercial power source to the open state so that, during the second sleep mode, the specific control system is supplied with power only from the electricity storage device. a mode switching controller (12, 200) that is configured to switch to one of at least an ordinary mode, in which power is received from a commercial power source and the power is the maximum supply capacity, and a first sleep mode, in which a lower power than in the ordinary mode is the supply capacity, and a second sleep mode in which power consumption is less than that of the first sleep mode; a first power supply section that is configured to supply power to a specific control system during the ordinary mode, and to continue to supply power to the specific control system during the first sleep mode; a second power supply section that is configured to supply power to components other than the specific control system during the ordinary mode, and to shut off a supply of power during the first sleep mode; a third power supply section that is connected to the second power supply section and a solar panel and that comprises an electricity storage device to be charged by the second power supply section and the solar panel, wherein the third power supply section is configured, during the first sleep mode, to supply power to the specific control system; a wiring system opening and closing unit that is provided at a downstream side relative to a power switch that shuts off the power supply of the commercial power source, the wiring system opening and closing unit being configured to set a power supply wiring system of the commercial power source to an open state or a closed state without regard to whether the power switch is on or off; the first power supply section and the second power supply section receiving power from the commercial power source via the wiring system opening and closing unit; and a controller (12, 56) that is configured, when the third power supply section is supplying power to the specific control system during the first sleep mode, and when it has been determined that a charging amount of the electricity storage device is sufficient for maintaining a sleep mode with a power which is supplied only from the electricity storage device while shutting down the commercial power source, to control the wiring system opening and closing unit and to set the power supply wiring system of the commercial power source to the open state so that, during the second sleep mode, the specific control system is supplied with power only from the electricity storage device.