In an industrial truck with a lifting frame (11) and a on the lifting frame (11) arranged to be adjustable in height load receiving means (13), wherein the lifting frame (11) has a lifting heights measuring system, which consists of a, a light beam (23) which emits light emitter (21), a receiving element as well as a, which are arranged between the measuring section (29) with an optical alignment member (22) as well as a target element (18), and wherein, in the stroke heights of the measuring system the length of the measuring section (29) with the lifting height changes, the alignment member (22) is movably mounted and, the light beam (23) of the position of the target member (18) are adjusted by means of a signal of the receiving element, a deviation of the light beam (23) of the sighting element (18) is detected.
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