FRESHNESS-RETAINING BAG AND METHOD FOR PRODUCING SAME

The purpose of the present invention is to provide a freshness-retaining bag making it possible to keep contents fresh for a long time. Provided is a freshness-retaining bag comprising a bonding region 105 that is 5 to 15 mm wide, where two ends 110a, 110b of a film have been superimposed and bonded. The bonding region includes: a plurality of ultrasonically welded sections 120 having ends bonded to one another; and non-bonded sections 130 which are arranged between adjacent ultrasonically welded sections and where ends of the film have been superimposed but not bonded to one another. The non-bonded sections constitute air passages creating communication between an interior space and the exterior, and the air passages have a width W that satisfies 0.2 mm less than or equal to W less than or equal to 3 mm and a length L that satisfies 20 mm less than or equal to...