Apparatus for supplying standby power

Provided is an apparatus for supplying standby power which comprises a means for supplying standby power based on a solar cell and another means for supplying standby power based on an industrial/domestic power supply, wherein the two means are selectively used by switching. The apparatus aims at saving, as much as possible, the energy consumption by the supply of standby power from the industrial/domestic power supply while maintaining the supply of standby power. The apparatus further aims at avoiding that, when the supply of standby power is switched between the two standby power supply means, data present at that instant in a personal computer to be supplied with the standby power and/or preset information stored in a microprocessor incorporated in an electric/electronic device will disappear. The apparatus for supplying standby power (1) is constructed comprising a first standby power supply means (2) for supplying standby power by means of a solar cell; a second standby power supply means (3) for supplying standby power by means of an industrial/domestic power supply; and a switching means (4) for preferentially supplying the standby power from the first standby power supply means (2) and for switching to the supply of standby power from the second standby power supply mean (3) when the standby power from the first standby power supply means (2) falls below a predetermined level, wherein the supply of the standby power is maintained by a backup section (16) when the switching is made.