Abstract: A hand-free holding device for mobile telephone set II including a back cover, a front cover, a releasing linkage and a movable piece which are placed between the back and front covers, the releasing linkage has a hook end to engage with a catch which has a wedge bottom and a recess top for a small spring arrangement, and retained by a rib inside the front cover, when the releasing linkage is depressed, the catch will be lifted up for position regulating of the movable piece for different types of mobile telephone sets.