The objective of the present invention is to provide: spherical biodegradable particles having an ameliorated insufficiency in flexibility having resistance to the occurrence of particle agglomeration and having an increased particle shape restoring force after passing through a catheter or the like and a method for producing the biodegradable particles. The present invention provides biodegradable particles formed from the chemical crosslinking of a synthetic polymer and a polyvalent carboxylic acid and having a moisture content in a water saturated state of 20 90%.
