To provide a biodegradable film which has biodegradability attributed to a lactic acid system resin, physical characteristics similar to OPP, superb heat resistance and durability to humidity/heat, further with a successful rolling-up nature and outstanding bag forming fitness, and a bag formed of this biodegradable film.

The biodegradable film is composed mainly of a lactic acid system resin and has the F2 value in the longitudinal direction adjusted to 30-55 MPa and the F2 value/F1 value ratio is set at 170% or less. In addition, the film has a layer containing 0.02-0.5 pts.wt of an inactive particle with an average particle diameter of 0.5-8 μm on the face and back of the film. The biodegradable bag is obtained by weld-cut sealing the biodegradable film like a bladder.

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