CUSHION AIRBAG DEVICE

A cushion airbag device is provided in a lower part of a seat cushion in a vehicle seat, and includes a cushion airbag inflated in a vertical direction by being supplied with gas from a pressure accumulation tank, a control valve provided in a first pipe communicating the cushion airbag and the pressure accumulation tank and adjusting an internal pressure of the cushion airbag, an exhaust valve provided in a first pipe between the control valve and the cushion airbag and exhausting gas from the inside of the cushion airbag, and a switching valve provided in a second pipe communicating the cushion airbag and the pressure accumulation tank and opened at the time of collision of the vehicle.