1. biodegradable particle comprising a block copolymer obtained by copolymerization of: a biodegradable copolymer having a structure formed by a hydroxycarboxylic acid a1, whose homopolymer obtained by homopolymerization has a glass transition temperature of not less than 40 ° C, and a hydroxycarboxylic acid a2 whose homopolymer by homopolymerizing it has a glass transition temperature of not more than -40 ° C water-soluble polymer comprising a functional group selected from the group consisting of a hydroxyl gr uppy, an amino group and a carboxyl group at each of both ends ipolivalentnogo compound comprising 2 or more functional groups each selected from the group consisting of a hydroxyl group, an amino group and a carboxyl group wherein the weight ratio of the above-mentioned structure formed by a hydroxycarboxylic acid a2, the weight of the above biodegradable copolymer is 30-90% mas.2 . Biodegradable particle according to claim 1, wherein the aforementioned block copolymer is a multiblock copolymer comprising a repeating unit represented by the below-mentioned general formula (I): wherein A represents a block formed from the above biodegradable copolymer or copolymer obtained by covalent binding of two or more of the foregoing biodegradable copolymers B is a block formed by the water-soluble polymer C represents a single bond or a structure formed of a polyvalent compound and n is the integer 1 or bolee.3. Biodegradable particle according to claim 1 or 2, wherein the compressive load at 40% in a water-saturated state is not more than 500 mN, and,1. Биоразрушаемая частица, включающая блоксополимер, получаемый путем сополимеризации:биоразрушаемого сополимера, имеющего структуру, образованную гидроксикарбоновой кислотой а1, гомополимер которой, получаемый путем гомополимеризации, имеет температуру стеклования не менее, чем 40°С, и гидроксикарбоновой кислотой а2, гомополимер которой, получаемый путем гомополимеризации, имеет температуру стеклования не более, чем -4
