PURPOSE: Provided is a cushion core material for a knapsack having increased productivity, reduced producing cost, excellent impact absorption force and air permeability. CONSTITUTION: The cushion core material is comprised of: a skin fabric(10) on the surface woven with a polyester yarn and formed a through hole(11) repeatedly and continuously; a skin fabric(20) on the backside woven with the polyester yarn on normal fabric type not having the through holes(11); and elastic core(30) of a nylon single yarn which is woven between the skin fabrics(10)(20) on zigzag type maintaining the interval of the skin fabrics(10)(20) elastically.
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