An occupant protection device (S) for protecting an occupant (MP) seated in a seat , the occupant protection device comprising: an airbag as a bag form configured of a sheet body having flexibility; a holding body in which the folded airbag is caused to be housed and held, and which is adapted to be disposed in front of a hip portion (MW) of an occupant seated in the seat; and an inflator that can supply an inflating gas to the airbag, wherein the airbag is of a configuration such as to protrude from the holding body owing to the inflating gas being caused to flow into an interior, and to inflate in such a way as to cover a region in front of the occupant, and is configured to include an occupant side wall portion that is adapted to be disposed on the occupant side when inflation is completed, and can restrain an upper body (MU)of the occupant, and the occupant side wall portion is configured in such a way that a lower side restraining face , which can restrain a range from an abdominal portion (MA) to a chest portion (MB) of the occupant, and an upper side restraining face , which can restrain a head portion (MH) or a shoulder portion (MS) of the occupant, are disposed on a rear face side when inflation is completed, and a bended portion is disposed in a boundary region between the upper side restraining face and the lower side restraining face in such a way as to cause the upper side restraining face to protrude to the occupant side with respect to the lower side restraining face, characterized in that bended portion forming means that forms the bended portion is configured of a tuck portion formed by the occupant side wall portion being pinched in regions separated on up-down direction sides, and the regions being joined to each other, in an up-down direction intermediate region of the occupant side wall portion. an airbag as a bag form configured of a sheet body having flexibility; a holding body in which the folded airbag is caused to be housed and held, and which is adapted to be disposed in front of a hip portion (MW) of an occupant seated in the seat; and an inflator that can supply an inflating gas to the airbag, wherein the airbag is of a configuration such as to protrude from the holding body owing to the inflating gas being caused to flow into an interior, and to inflate in such a way as to cover a region in front of the occupant, and is configured to include an occupant side wall portion that is adapted to be disposed on the occupant side when inflation is completed, and can restrain an upper body (MU)of the occupant, and the occupant side wall portion is configured in such a way that a lower side restraining face , which can restrain a range from an abdominal portion (MA) to a chest portion (MB) of the occupant, and an upper side restraining face , which can restrain a head portion (MH) or a shoulder portion (MS) of the occupant, are disposed on a rear face side when inflation is completed, and a bended portion is disposed in a boundary region between the upper side restraining face and the lower side restraining face in such a way as to cause the upper side restraining face to protrude to the occupant side with respect to the lower side restraining face, characterized in that bended portion forming means that forms the bended portion is configured of a tuck portion formed by the occupant side wall portion being pinched in regions separated on up-down direction sides, and the regions being joined to each other, in an up-down direction intermediate region of the occupant side wall portion. <EOS>