To provide a linearly moving device for preventing the close contact of rolling bodies without causing large reduction in load capacity and the fall- down of a spacer.

The spacers 18 arranged between balls 15 are formed in roller shapes of diameters smaller than radius of the balls 15. A recessed surface part 19 for contacting with the ball 15 is arranged on the whole periphery of the spacer 18 on the peripheral surface of the spacer 18.