PROBLEM TO BE SOLVED: To provide a circular structure for pets that has a large opening area for the upper-side opening part of peripheral wall panels and superior usability due to a simple constitution in the circular structure for pets, in which the top panel is detachably attached to the upper side opening part of the peripheral wall panels where the sides of the front panel, the backside panel and the right and the left side face panels are mjutually connected.SOLUTION: An upper frame 21 is arranged on the top of the peripheral wall panels 2, support members 4, for pivotally supporting the end part of a corresponding top panel 3, are detachably arranged on the upper frame 21 of any one panel of the peripheral wall panels 2, and the top panel 3 is rotated around its end part as a revolving shaft and is constituted openably with respect to the upper-side opening part of the peripheral wall panels 2.COPYRIGHT: (C)2008,JPO&INPIT【課題】正面パネルと背面パネルと左右の側面パネルの各側辺が互いに連結された周壁パネルの上面開口部に天面パネルが着脱自在に取り付けられたペット用サークルにおいて、周壁パネルの上面開口部の開口面積が大きく使い勝手の良いペット用サークルを簡単な構成で提供する。【解決手段】周壁パネル2の上端には、上フレーム21が設けられており、周壁パネル2のうちいずれかのパネルの上フレーム21に、対応する天面パネル3の端部を軸支する支持部材4が着脱自在に取り付けられ、天面パネル3が当該端部を回転軸として回転し周壁パネル2の上面開口部に対して開閉自在に構成される。【選択図】 図1