An electronic device, a case, and a case mounting structure of the electronic device are provided. The electronic device includes a body and a cover for rotating based on a hinge portion in the body and opening and closing at a specified angle. The case includes a mounting portion for receiving at least part of an electronic device and a pressing projection for protruding outwards from the mounting portion and opening the cover in the electronic device by pressing at least part of the cover of the mounted electronic device. When the electronic device is mounting in the mounting portion and one side of the hinge portion is pressed by the pressing projection, the cover is opened at a specified angle and power of the electronic device is shut off.