Air intake apparatus

An air intake apparatus comprising:

• a first piece;
• an intermediate piece constituting a surge tank and joined to the first piece;
• and
• a second piece including an air intake passage upstream portion in communication with the surge tank, the second piece being joined to the intermediate piece;
• wherein
• the first piece and the intermediate piece constitute an air intake passage downstream portion in communication with the air intake passage upstream portion,
• the second piece further includes a flange portion that connects the air intake passage downstream portion and an air intake port of an internal combustion engine,
• the air intake passage upstream portion of the second piece includes a tubular portion extending in an arc form along an air intake passage,
• the flange portion is formed to be adjoined to the air intake passage upstream portion including the tubular portion extending in the arc form,
• the air intake passage upstream portion of the second piece is defined by two wall portions included in the second piece on a longitudinal section along the air intake passage, the flange portion of the second piece and a wall portion of the surge tank are adjoined to be integrally formed on the longitudinal section along the air intake passage, and a first joint portion that is joined relative to the intermediate piece is formed at a portion where the flange portion of the second piece and the wall portion of the surge tank are adjoined to be integrally formed.