PROBLEM TO BE SOLVED: To provide a movable mechanism facilitating the cable wiring work.SOLUTION: The movable mechanism 30 includes: a tubular outside member 50 extending in the axial direction and having an opening 51 extending in the axial direction from an end in the axial direction a tubular inside member 60 movably held within the outside member 50 in the axial direction, extending in the axial direction and having an opening 61 facing in the same direction as the opening 51 of the outside member 50 over the whole length in the axial direction and a lid 70 for openbably/closably covering the opening 61 of the inside member 60.COPYRIGHT: (C)2011,JPO&INPIT【課題】ケーブルの配線作業が容易な可動機構を提供する。【解決手段】可動機構30は、軸方向に延びる筒状の外側部材50であって、軸方向の端部から軸方向に延びる開口51が設けられた外側部材50と、外側部材50内に軸方向に移動可能に保持される、軸方向に延びる筒状の内側部材60であって、外側部材50の開口51と同じ方向を向く開口61が軸方向の全長にわたって設けられた内側部材60と、内側部材60の開口61を開閉可能に覆う蓋体70とを有する。【選択図】図6