INTAKE MANIFOLD

Provided is an intake manifold that is capable of discharging oil or water in a liquid reservoir in a stable manner. The intake manifold (2) includes an introduction section (10) for introducing air to a combustion chamber of an engine, a liquid reservoir (12) provided under the introduction section for retaining a liquid medium therein, a differential pressure tank (13) including a first chamber (24), a second chamber (25), and a differential pressure valve (23) for regulating a flow from the second chamber (25) to the first chamber (24), a return passage (14) for allowing the liquid medium accumulated in the liquid reservoir to return to the first chamber from the liquid reservoir when the pressure in the second chamber is higher than the pressure in the first chamber, and a exhaust passage (15) for discharging the liquid medium having flown into the second chamber from the first chamber to the instruction section when the pressure in the second chamber is lower than the pressure in the first chamber.