The disclosure describes an optical recording medium for recording, erasing and reading-out information by irradiation a laser beam, comprising:a lower dielectric protective layer, a phase-change-type recording layer, an upper dielectric protective layer and a metal reflective layer successively deposited on a transparent substrate formed with grooves, in whichboth of grooves and lands are used as a recorded region,a groove depth (d) satisfies the following relation (1):.lambda./7n