Occupant protection device

1. An occupant protection device which protects an occupant seated in a seat, comprising:

an airbag which is folded and accommodated as a bag shape made of a flexible sheet body; and

a holder configured to accommodate and hold the folded airbag, wherein:

the holder is a long body where one end side is set as a fixed side end and is connected to one side surface side of the seat and the other end side is set as a movable side end and is configured to be connected to the other side surface side of the seat and is arranged in front of a waist of the occupant seated on the seat when the movable side end is connected to the side surface side of the seat;

the airbag is connected to an inflator arranged on the seat side via a gas supply path portion arranged on the fixed end side, inflows inflation gas into the inside and inflates so as to protrude from the holder and toward the occupant side, and is configured to cover from an upper surface of a thigh of the occupant to a front surface of an upper body of the occupant when inflation is completed, the airbag including:

a lower inflation portion configured to cover the upper surface of the thigh when inflation is complete;

an upper inflation portion configured to cover the front surface of the upper body; and

a cross-inflation portion arranged between the lower inflation portion and the upper inflation portion;

a length dimension of the holder is set to a dimension which secures a space for arranging the inflated cross-inflation portion between the waist and the holder when the inflation of the airbag is completed; and

the holder is formed of a material having shape-retaining property and is curved in a substantially U-shape;

the holder includes a holder body, formed from a flexible-strip shaped body, whose length dimension can be adjusted.

2. An occupant protection device which protects an occupant seated in a seat, comprising:

an airbag which is folded and accommodated as a bag shape made of a flexible sheet body; and

a holder configured to accommodate and hold the folded airbag, wherein:

the holder is a long body where one end side is set as a fixed side end and is connected to one side surface side of the seat and the other end side is set as a movable side end and is configured to be connected to the other side surface side of the seat and is arranged in front of a waist of the occupant seated on the seat when the movable side end is connected to the side surface side of the seat;

the airbag is connected to an inflator arranged on the seat side via a gas supply path portion arranged on the fixed end side, inflows inflation gas into the inside and inflates so as to protrude from the holder and toward the occupant side, and is configured to cover from an upper surface of a thigh of the occupant to a front surface of an upper body of the occupant when inflation is completed, the airbag including:

a lower inflation portion configured to cover the upper surface of the thigh when inflation is complete;

an upper inflation portion configured to cover the front surface of the upper body; and

a cross-inflation portion arranged between the lower inflation portion and the upper inflation portion;

a length dimension of the holder is set to a dimension which secures a space for arranging the inflated cross-inflation portion between the waist and the holder when the inflation of the airbag is completed;

the holder includes a holder body, formed from a flexible strip-shaped body, whose length dimension can be adjusted;

the folded body in which the airbag is folded and the gas supply path portion extending from the folded body are arranged so as to be deviation-movable with respect to the holder body; and

the holder is arranged so as to cover an outer peripheral surface side of the holder body at positions between the folded body and the fixed side end and the movable side end, and the holder is configured to have a position adjusting unit configured to adjust a position of the folded body with respect to the occupant in a direction along the holder body when worn.

3. An occupant protection device which protects an occupant seated in a seat, comprising:

an airbag which is folded and accommodated as a bag shape made of a flexible sheet body; and

a holder configured to accommodate and hold the folded airbag, wherein:

the holder is a long body where one end side is set as a fixed side end and is connected to one side surface side of the seat and the other end side is set as a movable side end and is configured to be connected to the other side surface side of the seat and is arranged in front of a waist of the occupant seated on the seat when the movable side end is connected to the side surface side of the seat;

the airbag is connected to an inflator arranged on the seat side via a gas supply path portion arranged on the fixed end side, inflows inflation gas into the inside and inflates so as to protrude from the holder and toward the occupant side, and is configured to cover from an upper surface of a thigh of the occupant to a front surface of an upper body of the occupant when inflation is completed, the airbag including:

a lower inflation portion configured to cover the upper surface of the thigh when inflation is complete;

an upper inflation portion configured to cover the front surface of the upper body; and

a cross-inflation portion arranged between the lower inflation portion and the upper inflation portion;

a length dimension of the holder is set to a dimension which secures a space for arranging the inflated cross-inflation portion between the waist and the holder when the inflation of the airbag is completed;

a seatbelt is provided on the seat to connect a tongue plate, which is a boundary part between a shoulder belt and a lap belt, to a buckle provided on the seat side when worn; and

the holder is configured such that the movable side end is connected to the seat by using the buckle of the seat belt;

the holder includes a holder body, formed from a flexible strip-shaped body, whose length dimension can be adjusted.