PURPOSE: To provide an apparatus for controlling re-circulation of exhaust gas, which comprises a valve means disposed at a portion in an exhaust-gas re-circulating passage located downstreams of air-flow rate controlling valve, i.e., throttle valve for the purpose of controlling the sectional area of said re-circulating passage in association with the throttle valve, whereby it is enabled to re-circulate exhaust gas almost at an optimal rate also under low-load operation of engine.

CONSTITUTION: At a portion of exhaust-gas re-circulating passage located downstreams of throttle valve 3, there is provided a valve means 20 which is controlled in association with throttle valve 3. Valve element 22 of this valve means 20 is located near the fully closed position when throttle valve 3 is located in its idling position, and it opens gradually as the throttle valve 3 is opened. Thus, it is fully opened when throttle valve 3 is fully opened. With such an arrangement, in low- load operation of engine, when opening of throttle valve 3 is kept low, error in the flow rate of re-circulation gas can be minimized and thus exhaust gas can be re-circulated nearly at an optimal flow rate.