Exhaust gas recirculation system for internal combustion engine

An exhaust gas recirculation system is configured to enable a large amount of exhaust gas to be recirculated to the intake passage (2) of an engine while reducing contamination of the inside of the intake passage (2) caused by the recirculated exhaust gas and preventing damage to the intake passage (2) caused by the heat of the recirculated exhaust gas. The exhaust gas recirculation system comprises: a first recirculation path (31) for recirculating exhaust gas from an upstream section (12a) of the exhaust passage (12) located upstream of a catalytic converter unit (14); a second recirculation path (32) for recirculating exhaust gas from an downstream section (12b) of the exhaust passage (12) 12 located downstream of the catalytic converter unit (14); a two-way selector valve (42) configured to switch between a first recirculation state in which exhaust gas recirculation occurs via the first recirculation path (31) and a second recirculation state in which exhaust gas recirculation occurs via the second recirculation path (32); and a control unit (50). The control unit (50) controls the switching of the two-way selector valve (42) based on the temperature of the recirculated exhaust gas.