information in a recording layer located in a deeper position in some cases in that case recording layers which are insufficient in sn ratio are classified into a different layer group and the recording layers belonging to the different layer group are made large in reflectance in the present embodiment the recording layers belonging to the zero th group located in a deeper position are made larger in reflectance than the recording layers belonging to the first layer group as a result in both the zero th recording layer which is the deepest layer in the zero th layer group and the third recording layer which is the deepest layer in the first layer group a predetermined return light intensity can be ensured the method described heretofore is also the same in cases where the number of recording layers is not eight in a case where the number of recording layers is further increased the number of layer groups is increased as the occasion may demand a configuration of the media control information in the present invention will now be described fig5 is a diagram showing a data structure of a multilayer optical disc medium in the present invention data in each of the recording layers of the multilayer optical disc.