Japanese non-examined laid-open Patent Publication JP H9-37670 A discloses an absorbent panel for pets. The absorbent panel has a liquid-absorbent core panel between a top sheet and a back sheet. The core panel has a relatively thin central region and a relatively thick edge region. Thus, the absorbent panel is configured such that an edge region of the top side of the absorbent panel is higher than its central region or protrudes on the top side, while its back side is flat. With such a structure, urine is prevented from leaking out from a peripheral edge region of the absorbent panel.