To provide a running wheel for a pet which is simple in structure, easy to install and remove, and has a strong structure and is not easily broken.SOLUTION: The running wheel for a pet has a wheel body 10, an axial center structure 20, and a fixing structure 30. A through hole 11 is formed in one side wall of the ring body, and the axial center structure is a ring The bearing is attached to the main body and has a bearing 21 and an axial center 22. The bearing is fitted into the through hole of the wheel main body and the shaft center is integrally formed, and the front end portion 23, the intermediate portion 24, the rear end portion , And a stop plate 26. The front end portion is attached so as to extend into the interior of the wheel body and the intermediate portion is connected to the front end portion and penetrating through a bearing fitted in the through hole of the wheel main body, The portion is connected to the side opposite to the front end portion of the intermediate portion, the stop plate is provided between the intermediate portion and the rear end portion, and the fixing structure is attached to the axial center structure so as to sandwich the ring body .(FIG.【課題】構造が簡単で取り付けたり取り外したりしやすいと共に、構造が強固で壊れにくいペット用ランニングホイールを提供する。【解決手段】ペット用ランニングホイールは、輪本体10と、軸心構造20と、固定構造30とを有し、輪本体の一側の壁に貫通穴11が形成され、軸心構造は、輪本体に取り付けられ、ベアリング21及び軸心22を備え、ベアリングは、輪本体の貫通穴に嵌め込まれ、軸心は一体形成のものであり、前端部23と、中間部24と、後端部と、止め板26を備え、前端部は、輪本体の内部へ伸びるように取り付けられ、中間部は、前端部と連接すると共に輪本体の貫通穴に嵌め込まれているベアリングに貫設され、後端部は、中間部の前端部と反対する側と連接し、止め板が中間部と後端部との間に設けられ、固定構造は、輪本体を挟設するように軸心構造に取り付けられる。【選択図】図2