Vehicle side airbag device and occupant protection device

A vehicle side airbag device installed at a side section on a vehicle width direction outer side of a seatback of a vehicle seat configured to restrain an occupant using a three-point seatbelt, the vehicle side airbag device comprising:

• an inflator configured to generate gas in a vehicle side-on collision;
• a side airbag including a waist chamber configured to inflate and deploy from a lower portion of the side section toward a side of a waist of the occupant on receiving a supply of gas from the inflator, and a head chamber configured to inflate and deploy from an upper face side of the side section toward a side of a head of the occupant on receiving a supply of gas from the inflator;
• and
• a duct that extends along a vertical direction of the side airbag inside the side airbag, and is configured to guide gas from the inflator into the waist chamber and into the head chamber,
• wherein an upper side ejection port is formed at an upper end portion of the duct so as to open into the head chamber and to open further toward the head of the occupant than a shoulder belt of the seatbelt during inflation and deployment of the side airbag, and the upper side ejection port of the duct is set so as to be positioned adjacent to a stay of a headrest during inflation and deployment of the side airbag.

A vehicle side airbag device installed at a side section on a vehicle width direction outer side of a seatback of a vehicle seat configured to restrain an occupant using a three-point seatbelt, the vehicle side airbag device comprising:

• an inflator configured to generate gas in a vehicle side-on collision;
• a side airbag including a waist chamber configured to inflate and deploy from a lower portion of the side section toward a side of a waist of the occupant on receiving a supply of gas from the inflator, and a head chamber configured to inflate and deploy from an upper face side of the side section toward a side of a head of the occupant on receiving a supply of gas from the inflator;
• and
• a duct that extends along a vertical direction of the side airbag inside the side airbag, and is configured to guide gas from the inflator into the waist chamber and into the head chamber;
• wherein
• an upper ejection port of the duct opens inward in the seat width direction from a shoulder belt in a front view;
• the side airbag is housed inside the side section in a folded state;
• and
• in a housed state of the side airbag, a location including the head chamber extends from a shoulder part of the seatback toward a headrest.