To provide a seat moving device which is capable of front, rear, right and left movement operation and rotation operation of a seat with one operation, easy elevation even in a vehicle with a small space and easy response to change in car model or request.

A rotation disk 5 rotating within a plane in parallel with a face of a bottom plate 4 is placed on the upper face of the bottom face 4, a supporting frame 2 supporting the seat 1 is supported by the rotation disk 5 in capable of linear movement, a guide member 7 is provided at the supporting frame 2, and a guide groove 17 is formed on the bottom plate 4 for guiding the guide member 7 in the direction of rotation and the direction of linear movement of the seat 1.