The present invention provides an animal excreta disposal sheet that can rapidly absorb excreta produced by an animal such as a dog, allowing for the excreta to be absorbed without dispersing across the surface of the sheet. An absorbent member (3) of animal excreta disposal sheet (1) of the present invention comprises a first absorbent core (31) containing at least hydrophilic fibers and a second absorbent core (32) composed of a plurality of highly absorbent polymer particles (S). The plurality of highly absorbent polymer particles (S) includes a large-diameter particle group comprising a plurality of large-diameter highly absorbent polymer particles (S1), and a small-diameter particle group comprising a plurality of small-diameter highly absorbent polymer particles (S2). The mass proportions of the large-diameter particle group and the small-diameter particle group are each 15-60 mass%, and the total mass proportion of the large-diameter particle group and the small-diameter particle group is at least 50 mass%.本發明之目的係在於提供一種動物用排泄物處理薄片，其可將自狗等的動物所排出之排泄物迅速地吸收，並且不會朝薄片的面方向擴散而予以吸收。本發明的動物用排泄物處理薄片(1)中，吸收體(3)係具有至少包含親水性纖維的第1吸收芯材(31)、和藉由複數個高吸收性聚合物粒子(S)所構成的第2吸收芯材(32)，前述高吸收性聚合物粒子(S)係包含由複數個大粒徑高吸收性聚合物粒子(S1)所構成的大粒徑粒子群、和由複數個小粒徑高吸收性聚合物粒子(S2)所構成的小粒徑粒子群，且前述大粒徑粒子群及前述小粒徑粒子群的質量比例分別為15至60質量%，前述大粒徑粒子群及前述小粒徑粒子群的總計質量比例為50質量%以上。
