A scroll fluid machine comprising: a housing; a fixed scroll which is fixed to the housing and in which a spiral groove formed by a fixed wrap formed on a fixed end plate is blocked by a partition wall that partitions a low-pressure-side compression chamber and a high-pressure-side compression chamber; and a revolving scroll which is accommodated in the housing so as to face the fixed scroll to form the low-pressure-side compression chamber and the high-pressure-side compression chamber together with the fixed scroll and is revolvable supported by a driving shaft; the scroll fluid machine characterized by further comprising: a cover that forms an air guiding space between the fixed scroll and the cover so that a portion of cooling air supplied to at least one of the fixed scroll and the revolving scroll can be introduced into the air guiding space; and an intermediate cooler configured to cool pressurized gas discharged from the low-pressure-side compression chamber by heat exchange with the cooling air in the air guiding space so that the cooled pressurized gas is returned to the high-pressure-side compression chamber, wherein the intermediate cooler includes a radiating pipe arranged in the air guiding space so as to connect a low-pressure-side discharge port of the low-pressure-side compression chamber and a high-pressure-side inlet port of the high-pressure-side compression chamber, the radiating pipe is arranged to be folded back on an inner wall of the air guiding space, the radiating pipe is configured such that a plurality of radiating portion extending along the cooling air are connected by a plurality of folded-back portions formed to be lower than the plurality of radiating portions, and the low-pressure-side discharge port is disposed on a downstream side of the cooling air as compared to the high-pressure-side inlet port. a housing; a fixed scroll which is fixed to the housing and in which a spiral groove formed by a fixed wrap formed on a fixed end plate is blocked by a partition wall that partitions a low-pressure-side compression chamber and a high-pressure-side compression chamber; and a revolving scroll which is accommodated in the housing so as to face the fixed scroll to form the low-pressure-side compression chamber and the high-pressure-side compression chamber together with the fixed scroll and is revolvable supported by a driving shaft; the scroll fluid machine characterized by further comprising: a cover that forms an air guiding space between the fixed scroll and the cover so that a portion of cooling air supplied to at least one of the fixed scroll and the revolving scroll can be introduced into the air guiding space; and an intermediate cooler configured to cool pressurized gas discharged from the low-pressure-side compression chamber by heat exchange with the cooling air in the air guiding space so that the cooled pressurized gas is returned to the high-pressure-side compression chamber, wherein the intermediate cooler includes a radiating pipe arranged in the air guiding space so as to connect a low-pressure-side discharge port of the low-pressure-side compression chamber and a high-pressure-side inlet port of the high-pressure-side compression chamber, the radiating pipe is arranged to be folded back on an inner wall of the air guiding space, the radiating pipe is configured such that a plurality of radiating portion extending along the cooling air are connected by a plurality of folded-back portions formed to be lower than the plurality of radiating portions, and the low-pressure-side discharge port is disposed on a downstream side of the cooling air as compared to the high-pressure-side inlet port. a cover that forms an air guiding space between the fixed scroll and the cover so that a portion of cooling air supplied to at least one of the fixed scroll and the revolving scroll can be introduced into the air guiding space; and an intermediate cooler configured to cool pressurized gas discharged from the low-pressure-side compression chamber by heat exchange with the cooling air in the air guiding space so that the cooled pressurized gas is returned to the high-pressure-side compression chamber, wherein the intermediate cooler includes a radiating pipe arranged in the air guiding space so as to connect a low-pressure-side discharge port of the low-pressure-side compression chamber and a high-pressure-side inlet port of the high-pressure-side compression chamber, the radiating pipe is arranged to be folded back on an inner wall of the air guiding space, the radiating pipe is configured such that a plurality of radiating portion extending along the cooling air are connected by a plurality of folded-back portions formed to be lower than the plurality of radiating portions, and the low-pressure-side discharge port is disposed on a downstream side of the cooling air as compared to the high-pressure-side inlet port.