Patent ID: 8701545

Claim:
A rotation device comprising: a tubular actuator that inflates in a diameter direction so that a full length is shortened by being supplied with fluid; a placement member on which the actuator is arranged and to which one end part side of the actuator is fixed; a rotary member rotatably coupled to the placement member at an other end part side of the actuator; and a wire material for connecting the other end part of the actuator with the rotary member; wherein the placement member is provided with a projecting part on a surface thereof; wherein a projecting face of the projecting part has a first slope face where a projecting dimension thereof is higher from a connecting side of the rotary member to an intermediate portion of the projecting part, and a second slope face where a projecting dimension thereof is lower from the intermediate portion to the fixed side of the actuator, in a direction corresponding to the full length direction of the actuator, wherein the actuator is arranged on the projecting face of the projecting part; and wherein the second slope face is less slippery compared with the first slope face.