| 摘要 |
An object of the invention is to provide an optical recording medium and an optical information device that enable to improve the quality of a servo signal and a reproduction signal. In the case where shape-wise thicknesses tr1, tr2, tr3, and tr4 of a cover layer (42), a first intermediate layer (43), a second intermediate layer (44), and a third intermediate layer (45) are respectively converted into thicknesses t1, t2, t3, and t4 of the respective corresponding layers each having a predetermined refractive index "no", a defocus amount with respect to a layer having a refractive index nr± and a thickness tr± (satisfying: 1‰¦±‰¦n (where ± is a positive integer and n is an integer of 4 or more)), and a defocus amount with respect to a layer having the refractive index "no" and a thickness t ± (satisfying: 1 ‰¦5±‰¦n (where ± is a positive integer and n is an integer of 4 or more)) are equal to each other; and the thicknesses t1, t2, t3, and t4 satisfy |t1-(t2+t3+t4)|‰§1 µm, a difference between any two values of the thicknesses t1, t2, t3, and t4 is set to 1 µm or more in any case, and |(t1+t2)-(t3+t4)|‰§1 µm. |
