Curtain airbag device

A curtain airbag device that is housed at a top edge portion of a side window glass placement location of a vehicle body, the curtain airbag device comprising:

• a gas supply passage that receives supplied gas and is deployed along a top portion of the side window glass placement location and towards a vehicle bottom direction;
• an occupant protection portion that is deployed to a lower side of the gas supply passage by receiving supplied gas through the gas supply passage;
• a gas release section that releases gas from inside the gas supply passage when an internal pressure of the gas supply passage reaches a specific pressure or higher, the specific pressure being higher than a design deployment pressure;
• a plurality of attachment tabs that project out towards a vehicle top from a vehicle top end side of the gas supply passage at intervals along a vehicle front-rear direction, the plurality of attachment tabs are respectively attached to the top edge portion;
• and
• an internal pressure regulation chamber that accepts gas released by the gas release section, the internal pressure regulation chamber is integrally provided to the gas supply passage at a vehicle top side of the gas supply passage, the internal pressure regulation chamber is disposed between the plurality of attachment tabs;
• wherein the gas release section is configured such that when the internal pressure of the gas supply passage reaches the specific pressure or higher, the internal pressure causes a closed-off state between the gas supply passage and the internal pressure regulation chamber to change to a communicated state.