A first phase structure corrects at least one of a spherical aberration due to a difference between a protective substrate thickness t1 and a protective substrate thickness t2 and a spherical aberration due to a difference between a first wavelength λ1 and a second wavelength λ2, and a second phase structure corrects at least one of a spherical aberration generated when the first wavelength λ1 is changed in a range of ±10 nm, a best image point movement generated when the first wavelength λ1 is changed in a range of ±10 nm, and a spherical aberration generated when environmental temperature is changed.