A hologram recording method for recording information of signal light as
holograms in an optical recording medium, which includes illuminating
signal light at the optical recording medium; illuminating reference
light at the optical recording medium simultaneously with the signal
light such that an interference pattern is formed by the signal light and
the reference light intersecting in the optical recording medium; and
shifting a region in the optical recording medium at which the signal
light and the reference light intersect, by shifting an illumination
position of the reference light along an optical axis of the signal
light, thereby recording a plurality of holograms in the recording
medium.