PURPOSE: To make the amount of recirculated exhaust gas meet the characteristics of an engine equipped with a stepless transmission, by providing a first control valve interlocked with a throttle valve and a second control valve operated in response to the control vacuum varied according to the operational conditions of the engine in series with each other at an intermediate part of an exhaust-gas recirculating passage.

CONSTITUTION: At an intermediate part of an exhaust-gas recirculating passage 3, a first control valve 19 interlocked with a throttle valve 1 by a wire 27 and opened in proportion to the opening of the throttle valve 1 and a second control valve 20 operated in response to the control vacuum introduced to a vacuum chamber 34 of a diaphragm means 32 are provided in series with each other. The control vacuum introduced to the vacuum chamber 34 is obtained by degrading the suction vacuum of an engine supplied via a TV valve 16 that is closed when the engine temperature is low by the atmosphere introduced via a vacuum control valve 36 the opening and closing of which is controlled by a control circuit 46. With such an arrangement, it is enabled to make the amount of recirculated exhaust gas meet the characteristics of an engine equipped with a stepless transmission according to the opening of the throttle valve 1.