A supercharger-equipped internal combustion engine, comprising: a supercharger which includes, at some point in an intake passage, a centrifugal compressor having an impeller section (20b4) for housing a compressor impeller (20b3); an exhaust gas recirculation passage (40, 60, 70) which includes an exhaust gas recirculation introduction section (40a, 60a or 70a) connected with the intake passage and through which recirculated exhaust gas flows; and a blow-by gas passage (48, 62, 72) which includes a blow-by gas introduction section (48a, 62a, 72a) connected with the intake passage and through which blow-by gas flows, wherein the recirculated exhaust gas and the blow-by gas are introduced to an intake system in such a manner as to flow into the centrifugal compressor via the exhaust gas recirculation introduction section (40a, 60a or 70a) and the blow-by gas introduction section (48a, 62a or 72a), characterized in that the supercharger-equipped internal combustion engine further comprises a gas guide member (52, 60a and 62a, or 70a and 72a) which extends to an inside of an inlet section (20b2) of the centrifugal compressor or a section immediately before the inlet section (20b2) or the impeller section (20b4) of the centrifugal compressor and guides the recirculated exhaust gas and the blow-by gas toward the centrifugal compressor so that the recirculated exhaust gas and the blow-by gas are not mixed with each other until the recirculated exhaust gas and the blow-by gas enter into the impeller section (20b4) of the centrifugal compressor and so that the recirculated exhaust gas and the blow-by gas are suctioned into the impeller section (20b4) from different sections in a circumferential direction of the compressor impeller (20b3). a supercharger which includes, at some point in an intake passage, a centrifugal compressor having an impeller section (20b4) for housing a compressor impeller (20b3); an exhaust gas recirculation passage (40, 60, 70) which includes an exhaust gas recirculation introduction section (40a, 60a or 70a) connected with the intake passage and through which recirculated exhaust gas flows; and a blow-by gas passage (48, 62, 72) which includes a blow-by gas introduction section (48a, 62a, 72a) connected with the intake passage and through which blow-by gas flows, wherein the recirculated exhaust gas and the blow-by gas are introduced to an intake system in such a manner as to flow into the centrifugal compressor via the exhaust gas recirculation introduction section (40a, 60a or 70a) and the blow-by gas introduction section (48a, 62a or 72a), characterized in that the supercharger-equipped internal combustion engine further comprises a gas guide member (52, 60a and 62a, or 70a and 72a) which extends to an inside of an inlet section (20b2) of the centrifugal compressor or a section immediately before the inlet section (20b2) or the impeller section (20b4) of the centrifugal compressor and guides the recirculated exhaust gas and the blow-by gas toward the centrifugal compressor so that the recirculated exhaust gas and the blow-by gas are not mixed with each other until the recirculated exhaust gas and the blow-by gas enter into the impeller section (20b4) of the centrifugal compressor and so that the recirculated exhaust gas and the blow-by gas are suctioned into the impeller section (20b4) from different sections in a circumferential direction of the compressor impeller (20b3).