Airbag apparatus and method of manufacturing vehicle's airbag

To provide a technique of constructing a vehicle's airbag which contributes thorough protection of a passenger in case of vehicle accident. A vehicle's airbag 120 is configured in such a manner that, in the deployed and inflated state, the position of the upper edge of a left airbag section 123 out of a right airbag section 122 and the left airbag section 123, which is closer to a vehicle wall, comes to a position lower than the position of the upper edge of the right airbag section 122.