Intake air noise adjuster

摘要

An intake air noise adjuster (1) includes: a communicating conduit (4) including: a first end (4I) communicating to an intake air passage (2) to an engine (10), and a second end (4II) communicating to an external air (70); an elastic body (6) configured to block the communicating conduit (4); and a flow channel area changer {8, 8, (8a, 8b), 8, 8} configured to change a flow channel area of the communicating conduit (4) based on a change of an intake air negative pressure caused in the intake air passage (2).