An intake apparatus for an internal combustion engine comprises an intake manifold (1) with air feeding passages (3) adapted to be connected to and feed air to cylinders of an engine; a rotary valve (10) including a plurality of valve portions (11) in communication with the air feeding passages (3) through feed switch openings (7); a sealing member (60) fitted to the valve portion, the sealing member including ring portions (61) and interconnecting portions interconnecting the ring portions, recessed portions (76) defined on an outer side of the valve portions for receiving engaging portions (64) on inner sides of the interconnecting portions of the sealing members, wherein when the rotary valve is in the closed position, a first sealing gap (A) between the engaging portion and an inner face (77) of the recessed portion is set smaller than a valve gap (C) between the valve portion and the bore portion (8).