A pet sheet for pet excrement has a fluid-permeable surface sheet and a fluid-impermeable rear sheet. The pet sheet has a first folded section and a second folded section that are formed by the folding of the surface sheet and the rear sheet so as to protrude on the surface sheet side. The surface sheet and the rear sheet positioned on both sides of the first folded section and the second folded section, respectively, are configured so as to fold out and be used as the pet sheet. Ridge lines formed in the surface sheet in the first folded section and the second folded section extend continuously along a first direction parallel to the surface sheet, from one end of the surface sheet in the first direction to the other end thereof.
