formed of biodegradable resin products

A biodegradable article is molded from a material obtained by kneading or melting and mixing a biodegradable resin raw material and at least one of a biodegradable additive and an additive made of a substance existing in the nature. An injection molded article of a biodegradable resin containing a biodegradable resin and an antibiotic substance, an article moulded from a resin composition consisting of a polymer material having an ester bond in the polymer main chain thereof and an alkali or acid component in an amount effective for neutralizing an acidic or alkaline component contained in the polymer material, and a resin molded article having a layer of a biodegradable resin, and a layer of a photolytic resin covering the resin layer and containing an antibiotic are also disclosed.