In order to enable stable void-record with a laser power lower than that when adopting a conventional void recording system, an optical recording medium is provided with a recording layer wherein a plurality of boundary surfaces between resin layers are included and the intervals between the boundary surfaces are not larger than the focal depth of recording light. At the boundary surfaces between the resin layers, the sensitivity of recording void marks is improved. Accordingly, when providing the recording layer wherein the boundary surfaces are provided at intervals not larger than the focal depth of the recording light like this, that is, the recording layer nearly filled with the boundary surfaces, the sensitivity of recording the void marks in the recording layer can be improved entirely. This enables to save the laser power necessary for record to be lower than that in the past, thereby solving the problem in a conventional void record system, which further improves the possibility of a high-capacity recording medium as a bulk-type recording medium.