A multilayer optical recording medium comprises four recording layers
including an L0 layer, an L1 layer, an L2 layer, and L3 layer laminated
between a substrate and an optically transparent cover layer and
optically transparent spacer layers each provided between the recording
layers. The L2 layer has the negative dependence of the reflectance on
the incident angle of a laser light beam for reproduction. Crosstalk can
be effectively reduced by the relation between the configuration of the
respective recording layers and the crosstalk.