PROBLEM TO BE SOLVED: To simplify the structure of a rotary shaft type brake using a non-shear flow of a functional fluid such as an ER (electrorheological) fluid or an MR (magnetorheological) fluid, downsize and increase a braking force. A partition plate (18) is attached to a rotating disk (15) of a brake, and a fixing plate (16) is attached to an inner wall of a container. A gap (17) is provided between the rotating disc (15) and the fixed plate (16), and the functional fluid pushed by the partition plate (18) when the rotating disc (15) is rotated is the gap (17). ) Flow. By applying an electric field or magnetic field to the gap (17), the viscosity of the fluid in the gap (17) is changed to change the flow resistance, and the rotation resistance of the rotating disk (15), that is, the braking force is controlled. To do. A fixed plate (16) may be attached to the rotating disk (15) and a partition plate (18) may be attached to the inner wall of the container. An electric field or a magnetic field is also applied to the fluid in the gap (17) between the inner wall of the container and the rotating disk (15), the fluid does not leak from this gap (17), and the decrease in braking force is suppressed. [Selection diagram] Fig. 7
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