Abstract: Gas heat exchanger, in particular for the exhaust gases of an engine, intended for the flow of gases with exchange of heat with a coolant, comprising a gas reservoir (1) having an inlet opening (1a) which can be attached to an end of a casing, an outlet opening (1b) which is connected to a shoulder (2) for connecting to the gas recirculation line, a particle filter (3) for filtering the exhaust gases and associated with the outlet opening (1b) of said gas reservoir (6), and a sealing gasket (4) provided on an outer surface (2a) of the connection shoulder (2). The filter (3) is integral with the gas reservoir (1), thus forming an inseparable single piece suitable for being attached to the casing of the exchanger. The particle filter (3) and the sealing gasket (4) are thus assembled in an optimum manner.