PURPOSE: To improve the operability and make the whole of the device thin to improve the carriage function, by storing an input means and a printing means separately in two storing cases which are constituted to the shape of a trunk so that they can be opened and closed.

CONSTITUTION: A body-side storing case 11 and a cover-side storing case 12 of an attache case-type information processing device are connected with hinges. The body-side storing case 11 is provided with an input part 13 of the keyboard system. The cover-side storing case 12 is provided with a printing part 14. A display part 17 is provided in the cover-side storing case 12 and is constituted with liquid crystal display elements. This display part 17 is recessed. The body- side storing case 11 is placed on a plane, and the cover-side storing case 12 is inclined to the body-side storing case 11 and is fixed.