Abstract: [Object] To provide a durable read-only optical recording medium having less variances in characteristics of a metal reflective film due to a temporal change. [Solving Means] Provided is a read-only optical recording medium (100) including: a substrate (101); an information recording surface onto which information is recorded by combining pits (P) and lands (L); and a metal reflective film (102) that is provided in contact with the information recording surface and represented by Al100-x-zXxZz, where x and z each represent an atomic %, X is constituted of an element including at least Ti, Z is constituted of an element including at least Fe, x is 1.0 to 3.0, and z is 0.05 to 1.0.

Abstract: [Object] To provide a durable read-only optical recording medium having less variances in characteristics of a metal reflective film due to a temporal change. [Solving Means] Provided is a read-only optical recording medium (100) including: a substrate (101); an information recording surface onto which information is recorded by combining pits (P) and lands (L); and a metal reflective film (102) that is provided in contact with the information recording surface and represented by Al100-x-zXxZz, where x and z each represent an atomic %, X is constituted of an element including at least Ti, Z is constituted of an element including at least Fe, x is 1.0 to 3.0, and z is 0.05 to 1.0.

Abstract: An optical information recording medium includes a recording layer in which a recording mark formed of a cavity is formed in accordance with a light for recording, and which contains therein a compound having a skeleton expressed by the general formula (1): where R1, R2, R3, and R4 are either hydrogen atoms or substituents.