Airbag for front passenger's seat

An airbag for front passenger's seat mountable on vehicle, the airbag being folded and housed in a top face of instrument panel in front of front passenger's seat, and upon inflow of inflation gas, the airbag protruding upward and deploying rearward of vehicle in such a manner as to occupy a space between the top face of instrument panel and a wind shield located above the instrument panel, the airbag, when completely inflated, being formed into a generally square conical shape whose top is located in a front end, the airbag comprising:

• an inlet port for introducing inflation gas, in the front end vicinity of the airbag as completely inflated;
• a protection portion contactable with a front seat passenger, in a rear side of the airbag as completely inflated;
• and
• a left side wall and a right side wall each arranged generally along front-rear orientation in left and right sides, an upper side wall and a lower side wall each arranged generally along left-right orientation in upper and lower sides, and a rear side wall arranged generally along left-right orientation to confront a passenger, in such a manner as to connect the upper side wall and the lower side wall;
• wherein:
• the airbag is formed by joining edges of a plurality of base cloths, and comprises:
• an outer panel constituting the left side wall and the right side wall;
• and
• an inner panel constituting the upper sidewall, the lower side wall and the rear side wall;
• the inner panel consists of a pair of inner panel base cloths having generally the same shapes, the inner panel base cloths has such a construction, upon airbag inflation, as to divide an area of the inner panel into two in left-right direction;
• each of the inner panel base cloths has a band shape curved in a generally C-shape, and an outer edge of each of the inner panel base cloths has generally the same shape as an outer edge of a portion of the outer panel constituting the left/right side wall;
• the inner panel is formed by joining the outer edges of the inner panel base cloths to the outer edges of the portions of the outer panel constituting the left and right side walls, and by joining inner edges of the inner panel base cloths to each other;
• and
• the protection portion comprises shoulder restraining portions disposed generally side by side in left-right orientation in an area from upper part to rear part of the completely inflated airbag, each of the shoulder restraining portions continuously projecting from upper part to rear part.