To manufacturing a recording medium formed with recording marks of a specified width and different depths.

The method for manufacturing the information recording master disk has at least a first process step of forming a plurality of layers of photoresist layers reacting with a plurality of prescribed different wavelengths on a recording master disk, a second process step of forming exposed parts of the prescribed width and the depths meeting the information to be recorded by irradiating the photoresist films with laser beams having a plurality of the prescribed different wavelengths and a third process step of developing the exposed parts and forming the prescribed recording patterns and manufactures the information recording master disk having the recording patterns of the depths meeting the information to be recorded.