Optical information recording medium and recording/reproduction method

Focusing and tracking can be stably performed using an optical information recording medium in which a high reflectivity and a large reflective change amount can be attained, and the reflectivity change amounts of the lands and grooves are set equal to each other by forming, between a transparent substrate and a first protective layer, an interference layer containing at least one material selected from the group consisting of Au, Ag, Cu, Si, and Ge. Even if information is recorded on the lands and the grooves, it can be recorded/reproduced without any crosstalk from an adjacent track.