Abstract: An electronic device is provided with a first panel selectively exposing the front face or the reverse face by being rotated, and a second panel mounted so that it is shifted between the position being flush with the first panel and the position where it is retracted into the system body. A braking unit for panels in which a resilient pressing member mounted on the second panel is brought into abutment with the first panel when the second panel is shifted from the position within the system body to the position being flush with the first panel that is exposing its front face is further provided. An electronic device further comprises an urging member fixed on the axial rod of the first panel and an urging operation element formed with a resiliently deformable oblique line on a part of the urging member.