Curtain airbag device

A curtain airbag device capable of spreading an airbag main body provided along a roof side rail of a vehicle into a curtain shape and into a vehicle compartment by operation of an inflator,

• wherein the airbag main body is disposed at a position where the airbag main body overlaps with a center pillar, and includes, in a spread state, a first expanding portion to which gas is supplied by operation of the inflator, a second expanding portion to which gas is supplied from the first expanding portion, the second expanding portion being disposed posterior to the first expanding portion, and a gas communicating for communication between the first expanding portion and the second expanding portion,
• wherein the first expanding portion is isolated from the second expanding portion by first and second partitioning portions, the first and second partitioning portions together define the gas communication portion,
• wherein the air bag device is adapted to supply the gas to the first expanding portion from the inflator via an inlet portion and a branch portion, and the gas flows from the inflator to the inlet portion, the branch portion, the first expanding portion, the gas communication portion and the second expanding portion in this order,
• and wherein the gas communicating portion is arranged above a seatbelt interference region where the airbag main body in the spread state interferes with a seatbelt,
• wherein the airbag main body in the spread state further includes a non-expanding portion to which as is not supplied by operation of the inflator, the non-expanding portion is isolated from the first expanding portion by the first partitioning portion and a part of the non-expanding portion is arranged such as to overlap with the seatbelt interference region in the spread state,
• wherein the part of the non-expanding portion which overlaps with the seat belt interference region is arranged below the first expanding portion, and
• wherein the as communication portion is arranged above and rear of the part of the non-expanding portion which overlaps with the seat belt interference region.