Airbag device

An airbag device comprising:

• an airbag cushion part inflated by operating gas introduced thereto;
• a vent part comprising an opening formed through the airbag cushion part, and configured to discharge the operating gas within the airbag cushion part;
• a cord movement prevention part mounted on one side of the vent part;
• and
• one or more tether cord parts mounted on the other side of the vent part, and configured to tighten and close the vent part while passing through the cord movement prevention part, when the airbag cushion part is deployed, wherein, when the airbag cushion part is deployed, the one or more tether cord parts tightens the vent part and reduces a size of the opening of the vent part,
• wherein each of the one or more tether cord parts has one end fixed to the vent part and the other end inserted into the cord movement prevention part,
• wherein the other end of said each tether cord part tightens and closes the vent part while passing through the cord movement prevention part,
• wherein said each tether cord part has a stopper mounted at the other end thereof, and the stopper is configured to prevent said each tether cord part from separating from the cord movement prevention part, and
• wherein the stopper has a length larger than a width of the opening of the cord movement prevention part;
• wherein the cord movement prevention part is formed in a semicircular ring shape and, when the airbag cushion is deployed, the stopper is pulled toward the cord movement prevention part until impacting the cord movement prevention part, preventing said each tether cord part from separating from the cord movement prevention part.