Occupant protection device

An occupant protection device which is configured to protect an occupant seated on a seat, the occupant protection device comprising:

• a seat belt;
• an airbag which is disposed in an area of a lap belt of a seat belt, the lap belt configured to restrain a waist of the occupant when being worn;
• and
• an inflator which is configured to supply inflation gas to the airbag,
• wherein the airbag has a bag shape formed of a flexible sheet body, the airbag is folded and stored in a storage part provided in the lap belt, the airbag is inflated so as to project toward a front upper side when the inflation gas flows into the airbag, and the airbag has a substantially triangular prism shape whose axial direction is substantially aligned with a left-right direction so as to include a leg abutting surface which is capable of abutting an upper surface of a leg of the occupant and an upper body restraining surface which is capable of restraining the occupant from a chest to a head, when the airbag is completely inflated,
• wherein the airbag includes a bag main body and a conduit portion which is connected to the inflator to flow the inflation gas into the bag main body,
• wherein the bag main body has a bag shape by joining peripheral edges of an occupant side panel and a front side panel, the occupant side panel disposed on an occupant side when the airbag is completely inflated and forming a part from the leg abutting surface to the upper body restraining surface, the front side panel disposed on a front side when the airbag is completely inflated,
• wherein the occupant side panel includes a lower side part which forms the leg abutting surface and has a substantially hexagonal shape, and an upper side part which forms the upper body restraining surface and has a substantially hexagonal shape, and the occupant side panel has an outer shape such that one side of the lower side part and one side of the upper side part are connected,
• wherein the front side panel has an outer shape which is a substantially hexagonal shape that substantially matches the lower side part and the upper side part which are opened so as to separate edges except edges respectively joined with each other and disposed on left and right sides of a connecting part of the occupant side panel, and
• wherein the occupant side panel and the front side panel are configured as separate panels.