Abstract: A case of tablet PC having a display area on the front side comprises; a housing 10 made of hard material to receive the tablet PC 1 as the front side display of it is exposed, including a first housing part 20 having the first hinge 21 on one side and the second hinge 23 on the other side, and a second housing part 30 hinged on the second hinge 23 of the first housing part 20 to be rotated toward the back side of the first housing part 20, and a cover 40 made of hard material and hinged on the first hinge 21 of the housing 10 on one side to open and close the front side display of the tablet PC 1 and having a stopper projection 41 on the other side, the second housing part 30 including side walls 12 to wrap around the side of the tablet PC 1, and the side walls 12 having inward projections 13 to cover the front edge of the tablet PC.