Air intake system

An air intake system (2) includes an intake pipe (20) and a throttle body (32). The throttle body (32) is inserted in a middle section of the intake pipe (20) between upstream and down stream ends so as to define an intake passage (39). The throttle body (32) movably receives a throttle valve (36) which opens and closes the intake passage (39). Flow blocking members (50, 60) are integrally formed with the intake pipe (20) for blocking specific fluid, such as condensate of intake gas, from flowing into the throttle valve (36) in the intake passage (39). Therefore, it can prevent the specific fluid from sticking to the throttle valve (36). Besides, because the throttle body (32) need not to be integrally formed with the flow blocking members (50, 60), a dimensional accuracy of the throttle body (32) can be secured.