A hand-held game machine (10) includes a horizontally-long rectangular housing (12), and the housing is covered with a cover (14) almost entirely. A main surface of the housing is curved so as to become higher at the center of the housing in a horizontal direction and become lower toward right and left end portions. The cover to be attached on the housing is also curved according to the curve. At a center of the cover, a transparent window (34) is formed, and a display (36) is placed below it on the housing.