A height adjusting structure for a stand of a display device is provided. The stand includes a guide rail, base, supporting unit, and guide unit. The guide rail is fixedly installed to a rear surface of the display device. The base is supported on a horizontal surface. The supporting unit extends upward from the base. The guide unit is fixedly installed on the supporting unit, to be guided and moved along the guide rail. The height adjusting structure uses a minimum number of parts, is easy to assemble, is highly resistant to external shocks, is able to securely support a display device, operates quieter, and has improved operating reliability.