PURPOSE: To reduce the directional property of the strength of a joint by a method wherein a joined singlet texture zone formed to the outer periphery of a circular double hollow weave part is formed with two kinds of zones different in a weave texture and a radial direction, and an inner weave texture is of more loose texture than an outer weave texture.

CONSTITUTION: A joined singlet texture zone is formed to the outer periphery of a substantially circular double hollow weave part (the surface side 2 and the back side 3) for s fluid introduction bag part, and the joined singlet texture zone is formed with an inner zone 4 and an outer zone 5. The inner zone 4 is woven in a more loose weave texture, formed with threads being apt to slip over each other, compared with the weave texture of the outer zone 5. This constitution reduces the directional property of the strength of a joint and increases the strength of the joint to a value high enough for the use of a product as an air bag 1.