A portable electronic apparatus includes coupled first and second casings with respective image display surfaces, and including a full-closed state where both casings are overlaid on each other, a tilt state where the second casing has been moved from the full-closed state so that the image display surfaces in both casings are exposed and, also, the image display surface in the second casing is inclined with respect to the image display surface in the first casing at an angle of opening which is equal to or more than 90 degrees but less than 180 degrees, and a full-open state where the image display surfaces in both casings are flushed with each other in the same plane, and the portable electronic apparatus being capable of holding the second casing, in attitude, with respect to the first casing in the full-closed state, in the tilt state and in the full-open state.