Optical information recording/reproducing apparatus

An optical information recording/reproducing apparatus for recording information on or reproducing information from an optical information recording medium using holography, comprising:

• a light source which emits a light beam;
• a splitter which splits the light beam emitted from the light source into a first light beam and a second light beam;
• a first lens for exposing an optical information recording medium to convergent light of the first light beam;
• an optical path angle varying device which includes a scanner lens which causes the second light beam to become incident at substantially the same position as the first light beam in the optical information recording medium and an optical path angle varying element which changes an angle of incidence of the second light beam incident on the optical information recording medium;
• and
• an optical path shifting element which shifts a position of a light beam incident on the optical information recording medium, according to an angle to the optical information recording medium of the light beam incident on the optical information recording medium.