A cover member is placeable along an outer peripheral edge of an absorbent member to partly cover the absorbent member. The absorbent member is a pet discharge absorbable sheet-shaped member. The cover member has a predetermined width in a direction crossing the outer peripheral edge of the absorbent member, and an upper surface with a slanted portion having a downward inclination extending widthwise from an outer peripheral side of the cover member toward an inner peripheral side of the cover member.
