To provide a low air-permeable air bag base fabric which is lightweight and has soft feeling while keeping mechanical properties necessary as an air bag, slightly leaks gas in air bag unfolding and maintains internal pressure of the air bag when a passenger enters the air bag after unfolding, and an air bag.
The air bag base fabric has a constitution that, in an air bag comprising a synthetic fiber woven fabric, the woven fabric is constituted of a synthetic fiber multifilament yarn and has 1,800-2,150 cover factor and has, in relation between fluid pressure (x) and air permeability (y) of the woven fabric, a relation between x and dy/dx represented by formula 1: 4.9≤x≤78.4, y≤90 and dy/dx≤1.4 (formula I) [(y): air permeability (cc/cm2/sec), (x): fluid pressure (kPa)]. The air bag is constituted by using the air bag base fabric.
MORIMOTO ATSUSHI
SEKI MASAO
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