A gas combustion type driving tool includes a feed piston/cylinder mechanism 6 by which a feed piston 8, engaged/disengaged to/from a connecting fastener housed in a magazine, is reciprocated in a fastener feed direction in which the piston is fed toward a nose part 5 and a retracting direction opposite to the feed direction. The feed piston 8 is constantly spring-urged in the feed direction, and part of a combustion gas is supplied to a feed cylinder 7 via a gas pipe 21 provided between the combustion chamber 4 and the feed piston/cylinder mechanism 6, thereby operating the feed piston 8 in the retracting direction against a spring 20. In the gas combustion type driving tool, filters 33 for cooling a combustion gas are located in the gas pipe 21.