To provide an intake manifold capable of improving the performance of an internal combustion engine.

The intake manifold 4 has an introducing portion 46, a bending portion 47, and a leading-out portion 48. The introducing portion 46 is a part into which intake air flows, and extends along a first center line A1. The bending portion 47 is connected to a downstream side of the introducing portion 46, and extends along a bending second center line A2. The leading-out portion 48 connects the bending portion 47 and an intake port 21 of a cylinder head 2, and extends along a third center line A3. The leading-out portion 48 has a first leading-out suppressing portion 48a suppressing the disappearance of vortex flows S1, S2 generated in the bending portion 47.