The present invention addresses the problem of providing: a composition for filling a soft capsule, the composition being suitable for filling； and a soft capsule filled with the composition. The present invention is a composition for filling a soft capsule, the composition containing an edible oil and a powdered fat/oil composition that contains a fat/oil component including one or more XXX-type triglycerides having a Cx fatty acid residue X at positions 1-3 of glycerin, wherein the composition for filling a soft capsule is characterized in that the carbon number x is an integer selected from 10-22, the fat/oil component includes a [beta]-type fat/oil, the particles of the powdered fat/oil composition are plate-shaped, the average grain size of the powdered fat/oil composition is 50 [mu]m or less, and the viscosity of the composition for filling a soft capsule at 20 DEG C is 500-150,000 mPa.s.本發明提供一種具有填充適應性的軟膠囊填充用組成物及填充了該組成物的軟膠囊。一種軟膠囊填充用組成物，含有粉末油脂組成物以及食用油，所述粉末油脂組成物含有油脂成分，所述油脂成分包含在甘油的1位～3位具有碳數x的脂肪酸殘基X的一種以上的XXX型三酸甘油酯，所述軟膠囊填充用組成物的特徵在於：所述碳數x為選自10～22的整數，所述油脂成分包含β型油脂，所述粉末油脂組成物的粒子為板狀形狀，所述粉末油脂組成物的平均粒徑為50 μm以下，所述軟膠囊填充用組成物在20℃下的黏度為500 mPa·s～150000 mPa·s。
