To provide a hinge to hold a liquid crystal unit such as a video camera free to store, develop and rotate.

This device is furnished with an opening and closing friction torque generating means to press fit an opening and closing shaft 11 of a slightly larger diameter than a diameter of a winding spring in a single winding spring part 16 applied with a winding direction from both of reciprocal directions and added with an opening and closing angle regulation device, a rotational friction torque generating means structured to tighten a corrugated plate type spring and a retaining ring to generate friction torque of an axis of rotation 12, a means added with a projection for rotational stop and a projection for click and a mechanism to carry out rotational regulation by fitting a rotational regulation shaft having a parallel surface on a paralleled contact surface set on a part of the winding spring press fitted on the opening and closing shaft. The device generates uniform friction torque at either position of both of the shafts of the opening and closing shaft and the axis of rotation 12.