The invention relates to an exhaust gas purification system applied to an internal combustion engine. The engine has a turbocharger including a turbine wheel and a housing for housing the turbine wheel. The housing defines a turbine outlet passage communicating with an exhaust gas discharging part of the turbine wheel. The engine further has an exhaust passage part communicating with an exhaust gas outlet of the turbine outlet passage. The system comprises an exhaust gas purification apparatus disposed in the exhaust passage part at a position adjacent to the exhaust gas outlet of the turbine outlet passage. Further, the apparatus includes an exhaust gas purification member. The member is provided such that its density in a peripheral part of the exhaust passage part is larger than that in a central part of the exhaust passage part and a flow passage resistance per unit volume of the member at an area of the central part of the exhaust passage part is smaller than that at an area of the peripheral part of the exhaust passage part.