Portable electronic appliance including a pressure sensor

In an electronic apparatus worn on the wrist such as a diver's wristwatch or an altimeter, a pressure sensor ( 10 ) is mounted from the exterior in a housing ( 11 ), located in one flank ( 9 ) of the case ( 2 ) of the apparatus and closed by a cap ( 13 ) provided with at least one orifice ( 32 ) for transmitting the ambient pressure towards said housing. The sensor is mounted in the housing by means of a sealing gasket ( 12 ). A protective screen ( 14 ) is placed between the central wall ( 31 ) of the cap and the exposed surface ( 22 ) of the sensor, in order to prevent solid bodies and/or solar light being able to damage the sensor. Preferably, this screen is formed by a perforated plate fixed to the cap and whose holes ( 42 ) are shifted laterally with respect to each orifice ( 32 ) of the cap, such that all of the transmission paths of the ambient pressure from the exterior to the exposed surface of the sensor are sinuous.