PROBLEM TO BE SOLVED: To easily reach a target position along a passage in comparison with a configuration to be pushed from a rear part and propelled.SOLUTION: In two joint blocks (11) disposed in adjacent to each other in a longitudinal direction, an actuator (1) includes a first interlocking member (26) formed by connecting a first frame body (18) of one of the joint blocks (11) and a first valve element (14) of the other joint block (11), and moving the first valve element (14) to an inflow position where a fluid flows into an outer expansion/contraction portion (21) of inclination in interlocking with inclination of the first frame body (18), and a second interlocking member (27) formed by connecting a second frame body (12) and a second valve element (16) of each joint block (11), and moving the second valve element (16) to a seal position for sealing the fluid of the outer expansion/contraction portion (21) of the inclination in interlocking with expansion/contraction of the expansion/contraction portion (21).SELECTED DRAWING: Figure 2COPYRIGHT: (C)2020,JPO&INPIT【課題】後ろから押し込んで推進する形態に比べて、経路に沿って目的の位置まで到達しやすくすること。【解決手段】長手方向に対して隣接して配置された２つの関節ブロック（１１）において、一方の関節ブロック（１１）の第１の枠体（１８）と、他方の関節ブロック（１１）の第１の弁体（１４）とを接続して、第１の枠体（１８）の傾斜に連動して、傾斜の外側の伸縮部（２１）へ流体が流入する流入位置に第１の弁体（１４）を移動させる第１の連動部材（２６）と、各関節ブロック（１１）の第２の枠体（１２）と第２の弁体（１６）とを接続して、伸縮部（２１）の伸縮に連動して、傾斜の外側の伸縮部（２１）の流体を封止する封止位置に第２の弁体（１６）を移動させる第２の連動部材（２７）と、を備えたアクチュエータ（１）。【選択図】図２
