The invention relates to a device for measuring static and/or dynamic wheel loads or wheel contact forces, particularly of rail vehicles. The inventive measuring device comprises at least two load-receiving blocks with internal measuring sections and elements for holding and bracing the load-receiving blocks in a track system, at least two support means being arranged within one load-receiving block. The terminal pieces of a rod-shaped measuring section are mounted on the support means which are provided with stops locking said support means within the track system. At least two force-deflecting elements are disposed between a single-arm bracing device and the track system. Internal jamming of the whole assembly during mounting and dismounting and especially during the measuring process is excluded due to the overall design of the measuring blocks, particularly the force-deflecting elements that have a power flux-adequate design and the coupling construction which comprises a receiving element on the measuring block and a spherical zone with a guiding piece on the single-arm bracing device. Optimal adaptation to the specific assembly situation can be ensured by means of special configurations of the two terminal pieces of the single-arm bracing device such that tilting and lifting phenomena of the entire measuring device are excluded under load.