PROBLEM TO BE SOLVED: To provide an intratubular moving body capable of improving moving speed in a tube and a method for controlling the intratubular moving body.SOLUTION: An intratubular moving body having a cylindrical inner cylinder having blocked both ends in an axial direction and a cylindrical outer cylinder covering the inner cylinder in the state of having the blocked both ends in the axial direction and regulated in extension in the axial direction, comprises a plurality of first extendable units extending/contracting in the axial direction by supply/discharge of fluid to/from an air chamber formed between the inner cylinder and the outer cylinder. The intratubular moving body further comprises, between any of the plurality of first extendable units, a second extendable unit which includes a cylindrical inner side extendable body constituted of a coil spring and a coating body covering the outer periphery of the coil spring and having blocked both ends in the axial direction and a cylindrical outer side extendable body covering the inner side extendable body in the state of having the blocked both ends in the axial direction and extending/contracting in the axial direction by supply/discharge of fluid to/from an air chamber formed between the inner side extendable body and the outer side extendable body.SELECTED DRAWING: Figure 1【課題】管内における移動速度を向上可能な管内移動体及び管内移動体の制御方法を提供するを提供する。【解決手段】軸方向両端部が閉塞された筒状の内筒と、軸方向両端部が閉塞された状態で前記内筒を覆い、軸方向への伸長が規制された筒状の外筒とを有し、内筒と外筒との間に形成された気室内への流体の給排により、軸方向に伸縮する複数の第１伸縮ユニットを備えた管内移動体であって複数の第１伸縮ユニットのいずれかの間に、コイルばねと、当該コイルばねの外周を覆う被覆体とにより構成され、軸方向両端部が閉塞された筒状の内側伸縮体と、軸方向両端部が閉塞された状態で内側伸縮体を覆う筒状の外側伸縮体とを有し、内側伸縮体と外側伸縮体との間に形成された気室内への流体の給排により、軸方向に伸縮する第２伸縮ユニットを設けた。【選択図】図１
