An absorbent member of animal excreta disposal sheet includes a first absorbent core containing at least hydrophilic fibers and a second absorbent core composed of a plurality of highly absorbent polymer particles. The plurality of highly absorbent polymer particles includes a large-diameter particle group having a plurality of large-diameter highly absorbent polymer particles, and a small-diameter particle group having a plurality of small-diameter highly absorbent polymer particles. 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 %.
