A polyester resin particle contains polyester resin as matrix resin. The matrix resin shows a plurality of endothermic peaks by DSC detecting corresponding to crystal melting temperature. In each of a low-temperature area and a high-temperature area contains at least one of the endothermic peak, the maximum endothermic peak in the low-temperature area and the maximum endothermic peak in the high-temperature area shows a ratio of crystal melting heat(crystal melting heat in low-temperature/crystal melting heat in high-temperature)in a range of 0.1 to 1.5. The particles have a volume average particle size of 1 to 50μm.一種聚酯系樹脂粒子，係含有聚酯系樹脂作為基材樹脂，前述基材樹脂以DSC測定顯示對應結晶熔解溫度之複數吸熱波峰，前述吸熱波峰分別在低溫側區域與高溫側區域中各至少存在1個，前述低溫側區域之最大吸熱波峰與前述高溫側區域之最大吸熱波峰顯示0.1至1.5之範圍之結晶熔解熱量比(低溫側結晶熔解熱量/高溫側結晶熔解熱量)，且具有1至50μm之體積平均粒徑。
