INTAKE MANIFOLD

In an intake manifold 1 that incorporates an intercooler 10 that cools intake air entering an engine 30, an opening portion 2 is provided through which a core 20 of the intercooler 10 is inserted. A flange 11 is caused to extend from an end face of the core 20 that is inserted through the opening portion 2 into a flat surface-like shape and is attached to an external surface of an edge portion 3 of the opening portion 2. A top plate 12 is prepared which is formed separately from the flange 11, and the flange 11 is fixed to the external surface of the edge portion 3.