A pivotal mounting structure for an electronic device, an electronic device utilizing the pivotal mounting structure, and a method of mounting an electronic device on a rack. The pivotal mounting structure allows an electronic device to be mounted in a rack, and allows the electronic device to pivot up so that the front operating panel can be set at an angel with respect to the rack. The structure comprises a angle member, a side plate, a pivot shaft, a holding section, and a support device. The side plate is attached to the electronic device, and the angle member is attached to the rack. The pivotal shaft allows rotation between the angle member and the side plate. The holding section and the supporting device allows the angle between the angle plate and side plate to be maintained at specific angles.