To provide a sliding structure of a front door which can easily enter a pet accommodating space on the opposite side of a front frame of a pet circle.SOLUTION: A front door 27 for opening and closing an opening portion 26 opening on the front face of a front frame 2 of a pet circle 1 is provided. As the front door 27, a sliding door that slides the opening portion 26 along the wall surface on the other side end side adjacent to the other side end from the one side end is applied. Further, between the lower end positions of the front fence member one side member 202 at one side end of the opening portion 26 and the lower end position of the other end side of the opening portion 26 at the one side end of the front fence member main body 201, the lower end connecting member 203 Joined only by. One end of the lower transverse beam of the front door 27 is connected to the lower end connecting member 203 and the other end of the upper and lower horizontal bars of the front door 27 is connected to the upper and lower horizontal bars of the front fence member main body 201 by sliding mechanisms 7, 7, and 7, respectively.(FIG.【課題】ペット用サークルの前枠の向こう側にあるペット収容空間に対し安易に侵入することができる前扉のスライド構造を提供する。【解決手段】ペット用サークル1の前枠2の前面に開口する開口部26を開閉する前扉27を設ける。この前扉27として、開口部26をその一側端から他側端に隣接する他側端側の壁面に沿ってスライドするスライド扉を適用する。更に、開口部26の一側端の前柵部材一側材202と開口部26の他側端の前柵部材本体201の一側端の縦杆との下端位置同士の間を下端連結材203のみによって連結する。そして、前扉27の下側の横杆の一側端を下端連結材203に、前扉27の上下の横杆の他側端を前柵部材本体201の上下の横杆に、それぞれスライド機構7,7,7を介してスライド自在に支持している。【選択図】図3
