Abstract: A portable computer having cover support means is disclosed. The portable computer comprises a main body, a cover, a hinge mechanism, and cover support means. The cover has a display screen on its inside surface. The hinge mechanism connects the cover to the main body so as to allow the cover to be tilted relative to the main body around a horizontal tilting axis and to be swiveled around a vertical swiveling axis, the horizontal tilting axis being free from intersecting the horizontal swiveling axis. The cover support means supports the outside surface of the cover free from the display screen and prevents vibration of the cover, when the cover is swiveled at an angle of 180 degrees and tilted completely toward the main body so that the display screen faces upward.