To provide a rail-less moving rack device independently rotating each wheel when moving a moving rack, preventing a rotation error in each wheel, improving traveling accuracy, promptly moving the moving rack to a proper position, reducing parts count, simplifying a structure, decreasing failure, facilitating maintenance, and being inexpensive.

A wheel line wherein a plurality of the wheels rotating in a moving direction of the moving rack are arranged in the moving direction is provided. A plurality of the wheel lines is arranged in a line at a lower portion of the moving rack in a direction orthogonal to the moving direction. A driving motor is directly connected to a specified wheel in a specified wheel line.