A balanced support structure of an aerobics step contains: a body, a limitation ring, and at least one base. The body includes a step face and a receiving groove. The receiving groove has an opening, and the body includes a fixing groove. The limitation ring includes a circular orifice which has a large-diameter segment and a small-diameter segment, the small-diameter segment having a diameter that is less than the diameter of the large-diameter segment, and the large-diameter segment is in communication with the opening. The at least one base includes a holder, and each of the at least one base includes a column which has a spherical knob, wherein a diameter of the spherical knob is equal to or is less than a diameter of the receiving groove, and the diameter of the spherical knob is more than the diameter of the small-diameter segment of the circular orifice.
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