INTAKE SYSTEM FOR INTERNAL COMBUSTION ENGINE WITH SUPERCHARGER

An intake system (50, 250) of an internal combustion engine (100, 200) with a supercharger (20) includes: a negative pressure control valve (32,232) which is disposed in the upstream side than an intake side supercharger (22) in an intake passage (30); a first external gas introduction passage (51) which introduces a single external gas made of blow-by gas, at a part of the intake passage which is on the upstream side of the intake side supercharger and on the downstream side of the negative pressure control valve; and a fresh air introduction passage (61) which introduces fresh air to an internal combustion engine main body (10) from the upstream side of the negative pressure control valve.