An optical information recorder/reproducer that records and/or reproduces information into/from an optical information recording medium having an information layer using near field light, comprising: a condensing member for generating the near field light; a distance detection section that detects a distance between the condensing member and the optical information recording medium using return light from a region where the near field light is generated; a distance control section that controls the distance between the condensing member and the optical information recording medium; a focus position changing member that changes a focus position of the near field light in the optical information recording medium; a focus detection section that detects a state of focus on the information layer using reflection light from the information layer; a focus position adjusting section that adjusts a position of the focus position changing member; and a focus control section that focuses the near field light on the information layer, wherein the distance control section controls the distance between the condensing member and the optical information recording medium to be constant based on the detection result of the distance detection section, and the focus detection section detects the focused state and the focus control section controls the focus position changing member such that the near field light is focused on the information layer based on the detection result of the focused state with the distance between the condensing member and the optical information recording medium controlled to be constant; characterized in that: the focus position adjusting section adjusts the position of the focus position changing member such that the near field light is not focused on the information layer until the distance control section starts control the distance between the condensing member and the optical information recording medium to be constant; the focus position changing member is a beam expander having two lenses; the optical information recorder/reproducer further comprising: an actuator attached to at least one of the two lenses of the beam expander, which is configured to adjust the distance between the two lenses to change the focus position of the near filed light, wherein the actuator is controlled by the focus position adjusting section; a system control circuit configured to reduce the number of revolutions of a spindle motor at the moment of starting the operation of controlling the distance between the condensing member and the optical information recording medium; and the spindle motor configured to rotate the optical information recording medium. a condensing member for generating the near field light; a distance detection section that detects a distance between the condensing member and the optical information recording medium using return light from a region where the near field light is generated; a distance control section that controls the distance between the condensing member and the optical information recording medium; a focus position changing member that changes a focus position of the near field light in the optical information recording medium; a focus detection section that detects a state of focus on the information layer using reflection light from the information layer; a focus position adjusting section that adjusts a position of the focus position changing member; and a focus control section that focuses the near field light on the information layer, the focus position adjusting section adjusts the position of the focus position changing member such that the near field light is not focused on the information layer until the distance control section starts control the distance between the condensing member and the optical information recording medium to be constant; the focus position changing member is a beam expander having two lenses; the optical information recorder/reproducer further comprising: an actuator attached to at least one of the two lenses of the beam expander, which is configured to adjust the distance between the two lenses to change the focus position of the near filed light, wherein the actuator is controlled by the focus position adjusting section; a system control circuit configured to reduce the number of revolutions of a spindle motor at the moment of starting the operation of controlling the distance between the condensing member and the optical information recording medium; and an actuator attached to at least one of the two lenses of the beam expander, which is configured to adjust the distance between the two lenses to change the focus position of the near filed light, wherein the actuator is controlled by the focus position adjusting section; a system control circuit configured to reduce the number of revolutions of a spindle motor at the moment of starting the operation of controlling the distance between the condensing member and the optical information recording medium; and the spindle motor configured to rotate the optical information recording medium.