PROBLEM TO BE SOLVED: To provide a covered particle prevented from uneven dissolution and collapse of a covering layer and having long-time sustained releasability caused by regulating the uniformity of the film thickness of the covering layer so as to be in a prescribed level or more.SOLUTION: A covered particle is obtained by covering a core particle having 50-5,000 μm of a median diameter with a hardly water-soluble covering layer containing 1-30 pts.mass of a triacylglycerol having 8-12C fatty acids and 1-30 pts.mass of calcium stearate based on the whole hardly water-soluble covering layer. Further, the covered particle may have a water-soluble covering layer.COPYRIGHT: (C)2013,JPO&INPIT【課題】被覆層の膜厚均一性を一定水準以上にすることで、被覆層の不均一な溶解・崩壊が防止され、長時間の徐放性を有する被覆粒子を提供する。【解決手段】メディアン径50~5000μmの核粒子を、難水溶性被覆層全量に対し、1~30質量部の、炭素鎖長8~12の脂肪酸を有するトリアシルグリセロール、及び、1~30質量部のステアリン酸カルシウムを含有する難水溶性被覆層で被覆してなる、被覆粒子。本発明の被覆粒子は、さらに、水溶性被覆層を有していてもよい。【選択図】なし
