An upstream portion of an intake passage is positioned upstream of a supercharger. An intermediate portion is positioned between the supercharger and a throttle valve. A downstream portion is positioned downstream of the throttle valve. A blow-by gas processing apparatus has a first breather passage, a second breather passage, and an introduction passage. The first breather passage connects an interior of the engine with the downstream portion. The second breather passage has a pump that pressure feeds gas from the interior of the engine to the intake passage. The introduction passage connects at least one of the upstream portion and the intermediate portion with the interior of the engine. Accordingly, the interior of the engine is efficiently ventilated.