The present invention provides a PCV valve capable of suppressing the inflow of a resin-made foreign matter into a gas flow path. In the PCV valve, a first housing has a support portion that face a direction in which a first housing and a second housing are connected to support the valve seat, and a second housing has a first protruding portion protruding toward a valve seat of the support portionsupported by the first housing and abutting against the valve seat and a second protruding portion protruding toward the valve seat at a position closer to the gas flow path than the first protrudingportion. The protruding length of the first protruding portion is longer than the protruding length of the second protruding portion.