Intake manifold

An intake manifold including:

• a chamber section that extends along a cylinder column direction of a multi-cylinder internal combustion engine;
• an intake introduction section that extends from one end side along the cylinder column direction and bends toward a chamber section side, and whose downstream end is connected to substantially a central section along the cylinder column direction of the chamber section and whose upstream end is connected to an intake valve;
• and a plurality of branch pipes that, with respect to a connection region of the intake introduction section and the chamber section, have their upstream end connected to the chamber section on a first side and a second side along the cylinder column direction and have their downstream end connected to the internal combustion engine,
• a space on the second side partitioned by the intake introduction section, the chamber section, and the branch pipes being provided with a resonance chamber section that communicates via an opening with the chamber section, and a blow-by gas from the internal combustion engine being supplied to inside the intake introduction section through a gas introduction pipe communicating with the intake introduction section,
• the intake manifold comprising a communicating path that, in a state where the intake manifold has been attached to the internal combustion engine, opens in a downward portion with respect to an up-down direction of a vehicle in which the internal combustion engine is mounted, in the resonance chamber section and communicates with a bent section of the intake introduction section bent to the chamber section side.