An exhaust heating device for heating an exhaust gas led to an exhaust purifying device from an engine is disposed in a second exhaust passage that is located upstream of a confluent portion of a first exhaust passage connected through a turbine of a first turbocharger to the purifying device and the second passage connected to the purifying device through a turbine of a second turbocharger used primarily in a lower speed range of the engine than the first turbocharger in a state of bypassing the turbine of the first turbocharger and downstream of the turbine of the second turbocharger. A valve for regulating a flow of the exhaust gas in the second passage is disposed in the second passage that is located downstream of a branched portion of the first and second passages and upstream of the turbine of the second turbocharger.