To facilitate an adjustment operation of relative positions of a plurality of separate step members and a detachment operation of the separate step members.SOLUTION: An operation-part step composed of a combination of a plurality of separate step members 31R, 30 is provided. In a connection part between the separate step members 31R, 30 located adjacent to each other such that their respective upper surfaces are flush with or substantially flush with each other, connection parts 8 are provided, which are superposed one on the other such that the upper surfaces of the separate step members 31R, 30 are flush with or substantially flush with each other.SELECTED DRAWING: Figure 9【課題】複数個の分割ステップ部材間での相対位置の調節操作や、分割ステップ部材の脱着操作を簡便に行い易くする。【解決手段】複数個の分割ステップ部材３１Ｒ，３０の組み合わせで構成された運転部ステップを備え、上面側が面一、又はほぼ面一な状態で隣り合う位置にある前記分割ステップ部材３１Ｒ，３０同士の接続箇所に、前記分割ステップ部材３１Ｒ，３０同士の上面が面一又はほぼ面一な状態で上下に重なり合う接続部８を備えた。【選択図】図９
