Air intake device for internal combustion engine

An intake device for an internal combustion engine, the intake device comprising:

• a housing constituting an intake passage;
• a valve element including a valve portion arranged to open and close a part of the intake passage, and thereby to strengthen an intake air flow;
• and
• a receiving portion which is formed on a bottom wall of an aeration passage of the housing, and which is recessed in an arc shape along a movement trajectory of the valve portion,
• the valve portion including an outer side surface which confronts a bottom surface of the receiving portion, which has an arc shape, and which includes a seal portion that has a raised shape, and that extends along an edge portion on an upstream side of an intake direction, and second seal portions each of which has a raised shape, and which are provided along an edge portion on a downstream side of the intake direction only on both sides of an aeration window formed at a center of the edge portion on the downstream side of the intake direction,
• wherein the valve element includes a pair of side wall portions positioned at both ends of the valve portion;
• a side seal portion is provided on an outer side surface of each of the pair of the side wall portions confronting side wall surfaces of the intake passage;
• each of the side seal portions has a raised shape;
• and each of the side seal portions is continuous with the seal portion.