Spherical polyester resin particles characterized by including a polyester resin, having a degree of crystallization of 20% or lower, and having an average circularity of 0.96 or higher. The spherical polyester resin particles according to the present invention make it possible to provide resin particles suitable as: compounding agents for cosmetics such as foundation, antiperspirant, and scrub； various agents such as matting agents for paints, rheology modifiers, antiblocking agents, lubricity-imparting agents, light-diffusing agents, conducting agents, and medical diagnostics test agents； additives to molded articles such as automobile materials and building materials； etc.本發明之球狀聚酯系樹脂粒子之特徵在於：其包含聚酯系樹脂，且結晶度為20%以下，平均圓形度為0.96以上。本發明之球狀聚酯系樹脂粒子可提供一種適宜作為粉底、止汗劑、去角質劑等化妝料用之調配劑、塗料用消光劑、流變改質劑、抗黏連劑、滑動性賦予劑、光擴散劑、導電劑、醫療用診斷檢査劑等各種劑、針對汽車材料、建築材料等成形品之添加劑等之樹脂粒子群。
