To provide a wound dressing material that creates a moist environment necessary for fibroblast migration and proliferation as well as that can elute a wound healing component and an antimicrobial component.SOLUTION: The wound dressing material sustained-release particle of the present invention is characterized in comprising a composite particle composed of a biodegradable and/or bioabsorptive polymer, a calcium-based compound and a boron-based compound.SELECTED DRAWING: Figure 1【課題】繊維芽細胞の遊走や増殖に必要な湿潤環境を形成するとともに、創傷治癒成分及び抗菌性成分を溶出可能な創傷被覆材を提供する。【解決手段】本発明の創傷被覆材用徐放性粒子は、生分解性及び／または生体吸収性の高分子と、カルシウム系化合物と、ボロン系化合物とで構成される複合粒子からなることを特徴とする。【選択図】図１
