An exemplary rotating mechanism for rotating a second body relative to a first body is provided. The first body includes a pair of sidewalls, and the second body includes a pair of connecting arms. A first connecting piece rotatably connects one of the connecting arms to one of the sidewalls, and a second connecting piece rotatably connects the other connecting arm to the other sidewall. A resilient element connects the second connecting piece to a sidewall to provide a restoring force to the second connecting piece along a direction perpendicular to the sidewall. An angle positioner is fixed on the other sidewall and is sleeved on the first connecting piece. The angle positioner defines a positioning gap to engage with a pair of lugs extending from the first connecting piece for positioning a relative rotation angle between the first body and the second body.