To prevent the sliding of a roller in driving starting or braking starting in simple structure in a device for driving and braking a moving body through a passive part with a pair of rollers by installing a pair of rollers 61, 62 interposing the passive part 37 fixed to the moving body and long in the moving direction (X axis direction) from both sides in the Y axis direction perpendicularly crossing to the X axis direction.

A pressing member 67 pressing at least one roller 62 to the inside in the Y axis direction through a roller supporting member 66 rotatably supporting the roller 62 is installed. A pair of contact parts 66d, 66e coming in contact with the pressing member 67 is installed in a part outside in the Y axis direction than the center of the roller 62 of the roller supporting member 66 by offsetting in the rear and the front in the X axis direction against the neutral line (a) in the Y axis direction passing through the center of the roller, and the roller supporting member 66 is freely inclined in the front and the rear in the X axis direction on the contact parts 66d, 66e.