An electronic device includes a display surface, a back surface with a first portion and a second portion, and a support assembly. The support assembly includes a first, second, and third boards. The first board includes a first surface, detachably covering the first portion, and a second surface. The second board is bendably connected to the first board and combined with the second portion. The third board includes a pivoted end and a free end. The pivoted end is pivotally connected to the second surface and covers the second board and a portion of the first board. When the first board rotates relative to the first portion, the third board also rotates relative to the second board, the second surface faces the third board, and the second board simultaneously moves along the third board. Accordingly, the display surface is raised up a distance relative to the free end.