To improve operability or space saving performance when a keyboard is not used by providing an information processor in which the keyboard can be housed in the main body part even in use so as to be operated by a mouse while a display part is viewed.

This information processor 1 is provided with a main body part 2 having an information processing function, a display part 3 connected to the front face side of the main body 2, and a keyboard part 4 connected to the front face side of the main body 2. The keyboard part 4 is connected to the main body part 2 so as to be freely turnable so that the keyboard 4 can be overlapped on the display part 3, and the keyboard 4 is connected to the main body part 2 so as to be freely slidable so that the keyboard 4 can be housed in a housing space 21 formed inside the main body part 2.