Abstract: The present invention is to provide a holding device comprising a holding seat adapted to support and fasten a portable electronic device and including a plurality of apertures therethrough; a base affixed to a planar surface; and a fastening assembly having one end moveably mounted on one end of the base and including two opposite clamping units at the other end; wherein each of the clamping units is adapted to either pass the two apertures at the same side of the holding seat to fasten edges of the apertures for clamping the holding seat on the fastening assembly or disengage from the holding seat for detaching both the holding seat and the clamping unit without causing damage to the holding device due to excessive amount of force exertion thereupon.