The invention relates to an apparatus (110, 112) for determining at least one parameter of a fluid medium, in particular an intake-air mass of an internal combustion engine. The apparatus (110, 112) comprises a sensor chip (148) for measuring the parameter and a drive and evaluation electronic system (156) with a circuit carrier (160). The sensor chip (148) is arranged on a chip carrier (146) which can be placed into the fluid medium. The chip carrier (146) comprises a protrusion (166) of the circuit carrier (160), which protrusion is integral with the circuit carrier (160), wherein the sensor chip (148) is fixed to the protrusion (166).