Abstract: The transducer comprises a membrane that is deformable under the effect of a magnitude to be measured, a beam joined to the membrane to detect stresses transmitted by the membrane, and strain gauges affixed to the beam to produce a signal indicative of strains suffered by the beam. According to the invention both the beam and the membrane are formed as one element, with the part forming the beam having a thickness substantially greater than the part forming the membrane. The beam portion extends between two oppositely lying peripheral zones of the membrane, and comprises grooves. The bottom portions of the grooves constitute strain concentration zones in the vicinity of which the strain gauges are affixed. Preferably, the grooves are configured in two pairs, each pair being mutually symmetrical about the center of said beam.