Abstract: The invention relates to a stress gauge of the type having an acoustic resonant structure, including a piezoelectric transducer (10) connected to a holder (20), the holder (20) including opposite the piezoelectric transducer (10) an imbedded reflecting portion (40). The imbedded reflecting portion (40) reflects the volume acoustic waves generated by the piezoelectric transducer (10) when it is excited according to a harmonic mode of the structure and propagating into said holder (20), the reflecting portion (40) being arranged at a distance from the piezoelectric transducer (10) such that the integral of the stress on the propagation distance of the volume acoustic waves up to their reflection is different from zero.