Air intake apparatus for an internal combustion engine

An air intake apparatus comprising a collector connected commonly to a plurality of branches of intake pipes for supplying intake air to an internal combustion engine, an air chamber, a plurality of sub-branches of an air intake passage repectively, connected fluidly between said intake pipes and the air chamber, said branches and sub-branches being equal in number, and a cylindrical switching valve arranged within a cylindrically-shaped valve holder to block the flow in the air intake passage,

• wherein said cylindrical valve holder is arraned to intersect the associated said intake passage at a location of intersection of the latter with said air chamber,
• wherein an opening of said air chamber is provided only to said air intake passage, said air chamber being parallel to said collector and, together with said valve holder, arranged to intersect said plurality of branches,
• wherein said drive unit for driving the switching valve is connected to said switching valve, and
• wherein said plurality of branches of intake, said plurality of sub-branches of intake passages, and said cylindrically-shaped valve holder are integrally molded.