PROBLEM TO BE SOLVED: To form a drainboard that can separate excreta by using easily disposable cardboard as materials, and to provide a pet toilet using the drainboard as components.SOLUTION: In a drainboard 1 using cardboard as materials, a support cylindrical part 18 of a triangle tubular shape is formed by applying cut in a bottom plate 11, a side plate 15 with a mountain part and a valley part alternately formed in an upper end edge is made to stand up from the bottom plate 11, a step board 13 is folded so that a mountain part and a valley part can alternately be formed along a mountain fold line 13a and a valley fold line 13b, the step board 13 is mounted on an upper end edge of the side plate 15 by making each mountain part and valley part correspond to each other, both sides of the step board 13 are supported with the side plate 15 and a middle section of the step board 13 is supported with the support cylindrical part 18, and an outlet 11c of the bottom plate 11 is positioned below an outlet 13c provided along the valley fold line 13b of the step board 13. A pet toilet with an upper tray 2, a lower tray 3 and a roof 4 is constituted by using this drainboard 1.【課題】処分が容易な段ボール等を材料として、糞尿を分離できる簀の子を形成し、これを構成部材としたペット用トイレを提供する。【解決手段】段ボール等を材料とする簀の子１において、底板１１の内部に切込を入れて三角筒状の支持筒部１８を形成し、上端縁に山部と谷部とが交互に形成された側板１５を底板１１から起立させ、踏板１３を山折線１３ａ及び谷折線１３ｂに沿って山部と谷部とが交互に形成されるように折り曲げ、側板１５の上端縁に踏板１３をそれぞれの山部と谷部を対応させて載せ、踏板１３の両側部を側板１５で支持すると共に、踏板１３の中間部を支持筒部１８で支持し、踏板１３の谷折線１３ｂに沿って設けた排出口１３ｃの下方に底板１１の排出口１１ｃを位置させる。この簀の子１を用いて、上トレイ２、下トレイ３及び屋根４を備えたペット用トイレを構成する。【選択図】図２
