Engine intake system

An intake system of an engine, comprising:

• a first passage provided to an engine bay, for leading fresh air to the engine;
• a second passage branched from a branching part at an intermediate location of the first passage, and extending toward a cabin;
• and
• an intake noise increasing device provided to the second passage, and configured to increase intake pressure in response to an intake air pressure wave,
• wherein the intake noise increasing device has a cylindrical bellows part configured to expand and contract in a cylindrical axis direction, and a vibrating membrane formed integrally with the bellows part to close a first opening of the bellows part,
• wherein the second passage has an introducing passage section connected to a second opening of the bellows part, and extending toward the branching part,
• wherein the introducing passage section is disposed so as to be lowered while separating from the bellows part, and
• wherein when a center axis perpendicular to the vibrating membrane and passing through the membrane center of the vibrating membrane is a first center axis, and a center axis of the introducing passage section is a second center axis, an intersection of the first center axis and the second center axis is disposed on an opening plane of the second opening.