INFORMATION PROCESSOR

PURPOSE:To simultaneously fulfill miniaturization and weight reduction, operability, easiness for handling, electric noise suppression, and device main body rigidness by arranging a power source substrate equipped with a mounting part higher than a control substrate at the back part of a case main body. CONSTITUTION:In a partial layout in a case body 2 of a portable information processor 1, which is equipped with a floppy disk 4, keyboard 5, control substrate, and power source substrate 7, the power source substrate 7 is arranged at the back part, and large and high mounting parts 7a such as a capacitor and a radiating fin mounted on the power source substrate 7 are mounted so as to be condensed at one part of the substrate. Also, an upper case 10 is equipped with a window 10a whose part being one part of the substrate on which the large and high mounting parts 7a such as the capacitor and the radiating fin are mounted is notched, and the large and high mounting parts 7a are projecting from the upper case 10, and those parts are covered with a case cover 11. Thus, the power source substrate 7 can be incorporated without increasing the scale of the device main body, and an AC adaptor can be unnecessitated.