PROBLEM TO BE SOLVED: To provide a gas sensor (1) with a field-effect transistor (FET) for detecting gas or mixture gas in which attachment of a sensitivity layer (10) to the gate area of the sensor can be improved. SOLUTION: In this gas sensor, a porous adhesive (15) for attachment of the gas-sensitive layer (10) is arranged on the gate area (G). COPYRIGHT: (C)2010,JPO&INPIT