Variable air intake mechanism of engine

An air intake structure of an engine, comprising:

• a first intake air passage and a second intake air passage formed by branching of an intake air passage disposed downstream from a throttle valve;
• a plurality of intake ducts branched from a downstream end portion of said first intake air passage and a downstream end portion of said second intake air passage and having a downstream side connected to a plurality of cylinders provided in said engine;
• a first communication element capable of establishing communication between a neighborhood of said downstream end portion of said first intake air passage and a neighborhood of said downstream end portion of said second intake air passage;
• and
• a control element for controlling said first communication element in accordance with an operating state of said engine,
• said air intake structure further comprising a second communication element which, upstream from said first communication element in a flowing direction of intake air, can bring said first intake air passage and said second intake air passage into communication, and
• said control element being adapted to control said first communication element and said second communication element in accordance with the operating state of said engine.