To provide a monitor and a notebook-sized personal computer for letting a person standing behind view a monitor screen without moving the whole monitor or the personal computer itself wherein the thickness of a display part can be maintained as conventional, and its weight can be prevented from being increased, and its long term continuous use can be realized.

A monitor configured of a display part having a monitor screen, a support member for pivotally supporting the display part freely reversibly and a base part for holding the support member or the support member for pivotally supporting the display part having the monitor screen freely reversibly is pivotally supported at the rear part of this notebook-sized personal computer main body.