An image forming apparatus having at least two of a plurality of functions including copying, facsimile and printer functions includes a main power switch that is provided on an outer surface of the apparatus and a cover to cover the main power switch. The cover is capable of opening and closing. Because the main power switch cannot be operated unless the cover is opened, when a user inadvertently tries to turn off the main power switch, for example, at the end of a day, the user must first touch the cover and is thereby reminded that the switch which the user is trying to turn off, is actually the main power switch for the apparatus. Thus, the main power switch is prevented from being inadvertently or unconsciously turned off.