The present invention aims to provide a biodegradable material having animproved biodegradability, an enhanced shape recovery rate after deformationof thematerial and an improved flexibility. The present invention provides abiodegradablematerial which is a chemically cross-linked product of: a multivalent compoundAhaving 3 or more functional groups X such as hydroxyl group； a multivalentcompoundB having 3 or more functional groups Y such as carboxyl group； and a compoundChaving a structure originated from a hydroxycarboxylic acid whose homopolymerformed by homopolymerization has a glass transition point of -40°C orlower.
