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An open‐cage [60]fullerene was prepared through a multiple‐step sequence based on peroxide‐mediated cage‐opening reactions. Key steps include repeated C₆₀‐sensitized singlet‐oxygen oxidation of electron‐rich amino enol double bonds to form two lactone and two lactam moieties on the rim of the orifice. Single‐crystal X‐ray analysis shows that the 22‐membered orifice has an ellipsoid shape with the major axis at 6.7 Å and the minor axis at 3.5 Å. Encapsulation of H₂O₂ was observed under atmospheric pressure at room temperature. Oxygen is also effectively trapped during the process.