Optical information recording and reproducing device, optical information recording and reproducing method

An optical information recording method of recording on information on a recording medium, using holography, the method comprising:

• a step of performing irradiation with laser light;
• a step of splitting the laser light into reference light and signal light;
• a step of switching between transmission and shielding of the laser light by a light-shielding portion;
• a step of driving the switching between transmission or shielding of the light-shielding portion;
• and
• a step of moving the light-shielding portion,
• wherein when a plurality of pieces of page data are recorded on the same region of the recording medium while changing an incidence angle of the reference light on the recording medium,
• the light-shielding portion is inserted into an optical path of the laser, and
• in a state where the light-shielding portion transmits the laser, first page data is recorded on the recording medium at a first reference light angle, and
• when a change from the first reference light angle to a second reference light angle is performed, the light-shielding portion shields the laser.