PURPOSE: To reduce installing space by connecting a processor main body to an external keyboard device mechanically via a stand housing and assmebling them in one unit.

CONSTITUTION: A pair of right and left pivotal supporting parts 16a, 16b are formed on both right and left terminal parts of a stand connection part 15. When a computer 1 is used by connecting to the external keyboard device 11, the stand housing 31 is used, and a recessed part 33 in which the computer 1 can be fitted so as to be dismounted is formed on the front plane 32a of a housing main body 32, and moreover, a pair of right and left hinge parts 38a, 38b are provided in the housing main body 32. Leg mounting parts 50a, 50b formed on the right and left circumferential planes 32c of the housing main body 32 are constituted of lengthy dents extending from the circumferential planes 32c to the hinge parts 38a, 38b, and leg parts 51 which hold the stand housing 31 at a second position are connected to the leg mounting parts 50a, 50b.