Seat cushion airbag device and seat cushion airbag structure

A seat cushion airbag structure comprising:

• a seat support portion disposed below a seat surface in a seat of a vehicle;
• a seat cushion airbag disposed below the seat surface and above the seat support portion, the seat cushion airbag attached to the seat support portion at an airbag attachment portion, the seat cushion airbag expanding and inflating when an impact occurs in the vehicle;
• and
• a tether portion formed of fabric, the tether portion having a rear side attachment portion disposed on one end side in a longitudinal direction and a front side attachment portion disposed on another end side in the longitudinal direction, at least a part of the tether portion forming a lower side support portion disposed below the seat cushion airbag, wherein
• the tether portion is
• fixed to the seat support portion by the rear side attachment portion, and
• fixed to a front side portion disposed at a front side of the seat cushion airbag in an expanding and inflating direction, by the front side attachment portion,
• a connection portion between the rear side attachment portion and the front side attachment portion is attached to the seat support portion and the seat cushion airbag so as to pass through the airbag attachment portion, and
• a distance in routing between the airbag attachment portion and the front side attachment portion is increased during expansion and inflation in which the seat cushion airbag expands and inflates as compared with a distance in a normal state in which the seat cushion airbag does not expand, and the tether portion is pulled toward the front side attachment portion.