PURPOSE: To reduce the occupied area of a printer with a full keyboard.

CONSTITUTION: With respect to a printer 10 with a keyboard, one prism face of a printer main body 12 formed to a transversely long triangular prism constitutes a keyboard face 14, and another constitutes a printing face 16. In this case, the keyboard face 14 and the printing face 16 cross at about right angles. Various operation keys 18 are arranged on the keyboard face 14 and are freely protruded and sunk through angular holes 20 opened in the keyboard face. When this printer 10 is placed on paper with the printing face 16 down, the printing position is confirmed through a viewing window provided in another prism face.