This paper deals with the measurement of palato-lingual contact stress and pattern, during consonant productions using a force sensor mounted palatal plate. A force sensor is composed of a strain gauge and a fixed stainless beam, mounted together into a palatal plate, and attached to the hard palate. The palato-lingual contact stress is concentrated in the center of the fixed beam by a protuberance on the fixed beam. When the tongue touches the force sensor, the palato-lingual contact stress is detected from the strain of fixed beam. We have developed a prototype system, which consists of a five-force-sensor mounted palatal plate (thickness: lmm) and a multi-channel strain-meter. The five force sensors are placed approximately at a 6mm interval along the midsagittal line of the hard palate. The most anterior sensor is located 5mm posterior to the alveolar ridge. Output of the force sensor was proportional to the stress applied to the fixed beam and had on hysteresis. Error by the interference among the sensors was less than 5.4%. The palato-lingual contact stress and pattern for an adult male were measured during the productions of consonant/t, /d, /n/ using the present system.