An electronic device includes a first and second printed boards, a bottom plate fixed to first printed board, first and second rotating arms, and an electronic member. The first rotating arm has first and second ends and the second rotating arm includes third and fourth ends. The first and third ends are rotatably fixed to the bottom plate. The fourth end defines a sliding groove into which the second end is slidably fixed. When the second end rotates around the first end toward the bottom plate, the second end slides along the sliding groove and the third end rotates toward the bottom plate. An elastic member is between the first rotating arm and the bottom plate and when the first rotating arm rotates, the elastic member abuts against the bottom plate to drive the first printed board to move toward the second printed board.