Abstract: The present invention relates to an air vent structure for an inner air discharge of a helmet adapted to protect a user's head when a user rides a motorcycle, and in particular to an air vent structure for a helmet which is capable of preventing a breath steam from forming in an inner surface of a shield by installing an air vent in lower both sides of a shield installed in a front side of a helmet and accurately adjusting an opening and closing degree of an air vent. It is a primary object of the present invention to provide an air vent structure for a helmet which is capable of discharging an inner air based on the flow of an air of an air vent by installing an air vent at both lower sides of a shield of a helmet, improving a structure of an air flow of an air vent and accurately adjusting the amount of flowing air, and it is possible to adjust the flowing amount of air based on a helmet user's condition and a state of an inner and outer side of a helmet for thereby implementing a pleasant state.

Abstract: The present invention relates to a breath guard assembly for a helmet which is capable of effectively preventing a formation steam in a helmet shield, removing any inconvenience when wearing a helmet and capable of implementing an easier attaching and detaching operation of a breath guard from a helmet body.