An adjusting apparatus including first and second bases, a pivot shaft, an adjusting unit and a first cable is provided. The second base is disposed under the first base. The first and second bases are pivoted by the pivot shaft. The adjusting unit includes a first adjusting base and a first adjusting rod. The first adjusting rod is passed through the first base and the first adjusting base. The first cable has first and second sections, wherein the first and second sections have first end portions, the first end portions are fixed to the second base, and the first and second sections are held by the first adjusting base. When the first adjusting rod is rotated, the first adjusting base is moved relative first base, such that the first or second section is dragged and the second base is rotated around a first axis relative to the first base.