To provide a biodegradable resin composition that can manufacture a silage film excellent in the property to expansion, tensile strength, and sticking strength.

The biodegradable resin composition is obtained which is configured such that a solid particle of a prescribed particle size mainly consisting of a rice outer layer tissue component as a principal ingredient that has removed a rice bran component is bonded with a synthetic biodegradable resin, wherein the synthetic biodegradable resin is an ester biodegradable resin selected from the group consisting of an aliphatic polyester synthetic biodegradable resin, an aromatic polyester biodegradable resin or the mixture of the same, and the solid particle and the synthetic biodegradable resin are mixed so that the mass ratio of the solid particle to the synthetic biodegradable resin may become from 25:75 to 75:25 when the total of the same is assumed to be 100 pts.mass.