Airbag apparatus

An airbag apparatus comprising an airbag and a check valve, wherein the airbag has a plurality of inflation portions inflated by inflation gas, an adjacent pair of the inflation portions being connected to each other by a communication passage formed by a pair of communication passage walls, wherein the check valve has a pair of valve body portions provided in the communication passage, one of the inflation portions being a gas inflow inflation portion, which is inflated and deployed by a relatively high internal pressure, and another inflation portion being a gas outflow inflation portion, which is inflated and deployed by an internal pressure that is lower than that of the gas inflow inflation portion, wherein the check valve restricts flow of the inflation gas from the gas inflow inflation portion to the gas outflow inflation portion,

• the airbag apparatus being characterized in that end portions of the valve body portions that are in the vicinity of the gas outflow inflation are each connected to corresponding one of the communication passage wall by an outflow-side joint portion extending in a direction intersecting a direction in which the inflation gas flows through the communication passage, wherein each valve body portion has a flexible portion that is located in the vicinity of the outflow-side joint portion and between the outflow-side joint portion and the gas inflow inflation portion, wherein the flexible portion can be flexed toward the gas outflow inflation portion, wherein a first edge joint portion is provided on a side edge of one of the valve body portions, the first edge joint portion being used for joining the valve body portion to the corresponding communication passage wall, wherein a wall joint portion is provided on or in the vicinity of the first edge joint portion, the wall joint portion being used for joining the communication passage walls to each other, wherein a second edge joint portion is provided on a side edge of the other valve body portion, the second edge joint portion being used for joining the valve body portions to each other, and the second edge joint portion extending along the flowing direction of the inflation gas, wherein an auxiliary joint portion is provided in the vicinity of the second edge joint portion and between the first edge joint portion and the second edge joint portion, the auxiliary joint portion being used for joining the valve body portions to each other, and the auxiliary joint portion extending from the vicinity of the flexible portions toward the gas inflow inflation portion, and wherein a rigid portion, which is harder to flex than the flexible portion, is provided on or in the vicinity of the auxiliary joint portion, the rigid portion extending along the flowing direction of the inflation gas.