Provided is an airbag base fabric that has a low air permeability sufficient to ensure the safety of occupants and heat resistance sufficient to withstand high-power, high-temperature gas generated from a recent downsized inflator, and that is capable of being packaged compactly. Also provided is an airbag comprising the base fabric. An airbag base fabric comprising a synthetic fiber multifilament having a total fineness of 500 to 750 dtex, the airbag base fabric having an areal weight of 225 to 245 g/m2, air permeability at 20 kPa of 0.2 to 0.8 L/cm2/min, and edgecomb resistance according to the ASTM D 6479 method of 300 to 600 N in both warp and weft directions.