TECHNOLOGY FOCUS - POLYMERS - Preferred Resin: The biodegradable resin in the molding is an aliphatic or an alicyclic polyester resin, and has number average molecular weight of 10000-200000. The aliphatic or alicyclic polyester resin consists of 35-49.99 mol% of structural unit derived from aliphatic or alicyclic diol, 35-49.99 mol% of structural unit derived from aliphatic or alicyclic dicarboxylic acid and 0.02-30 mol% of structural unit derived from aliphatic or alicyclic hydroxy carboxylic acid. The structural unit derived from aliphatic or alicyclic diol is unit derived from 2-10C aliphatic diol or unit derived from 3-10C alicyclic diol, preferably unit derived from 1,4-butanediol. The structural unit derived from aliphatic or alicyclic dicarboxylic acid is unit derived from 2-12C aliphatic dicarboxylic acid or unit derived from 3-12C alicyclic dicarboxylic acid, preferably unit derived from succinic acid. The structural unit derived from aliphatic or alicyclic hydroxy carboxylic acid is unit derived from 2-12C 2- hydroxy alkanoic acid, preferably unit derived from lactic acid or glycolic acid. The biodegradable resin molding is crushed before contacting with compound and/or microorganism.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compound: The compound and/or microorganism which have decomposability of biodegradable resin are hydrolase or oxidative degradation enzyme. EXAMPLE - An aliphatic polyester resin consisting of structural unit derived from 1,4-butanediol (in mol%) (47.8), structural unit derived from succinic acid (47.8) and structural unit derived from lactic acid (4.4) and having number average molecular weight of 69000, was melt-extruded to form a 100 microm thick film. The film had tensile breaking strength of 350 kg/cm2 and tensile fracture elongation of 380%. 10 test pieces of 2 cmx2 cm size were cut from the film, and phosphate buffer containing lipase (5 unit/ml) and surfactant (0.005 wt.%) was applied to each test piece surface. After application of the buffer, the test pieces were embedded in a test field soil at a depth of 10 cm. The soil with embedded test piece was collected after two months, and biodegradation of test piece was found to be complete.