Patent ID: 6988478

Claim:
A resin intake manifold comprising: an intake flow passage of an intake fluid; a tank chamber communicated with a part of said intake passage and formed by at least three separated first, second and third pieces; and the resin intake manifold being manufactured by welding at least said first, second and third pieces while pressurizing, wherein said first and second pieces are structured such as to be welded to each other for forming the flow passage of the intake fluid, wherein said first piece is provided with a tubular peripheral wall portion commonly using a wall portion forming said intake flow passage and constituting said tank chamber, wherein said second piece is provided with a ceiling wall portion covering one end portion side of said peripheral wall portion, wherein said third piece is structured as a cover member closing another end portion side of said peripheral wall portion, wherein an outer weld collar portion for welded to said second piece is arranged in an outer peripheral edge of said first piece including said peripheral wall portion so as to be formed to protrude to an outer side, and wherein a portion weld to said third piece in said first piece is provided with an inner weld collar portion protruding to the inner peripheral wall surface of said peripheral wall portion in such a manner as to prevent an interference with a pressurizing jig supporting said outer weld collar portion at a time of welding said first piece and said second piece.