Abstract: An automatically adjustable safety harness, intended to be sewn into a lining which is equipped with fasteners for integration of the lining into a pair of working trousers. The harness has a waist belt which, via two connecting straps with fixed loops and via two position straps, is connected with end loops on two leg straps. The position straps hold the respective leg straps separated from the genitals of the user, and the connecting straps are moveable a predetermined distance relative to the waist belt, whereby the leg straps are movable from a loose, rest position to a tight, working position around the leg of the user, through the corresponding connecting straps being stretched by a force acting on respective fixed loop. The stroke length ensures that the respective leg straps do not tighten too firmly around the legs of the user.