Optical pick up and optical disc apparatus

An optical disc apparatus having an optical pickup that records and/or reproduces information signals by irradiating a light beam on an optical disc that is driven to rotate,

• wherein the optical pickup includes:
• a light source that emits a light beam having a predetermined wavelength;
• a plastic objective lens that condenses the light beam emitted from the light source on an optical disc;
• a light detector that receives the light beam reflected by the optical disc and detects the light beam;
• an objective lens driving unit that drives the objective lens in the tilt direction to tilt the objective lens;
• and
• a lens tilt sensitivity sensing unit that senses a lens tilt sensitivity that is denoted by ΔWLT/Δθ, in which ΔWLT [λrms] is a coma aberration amount occurring at the time of tilting the objective lens and Δθ [deg] is a lens tilt amount at that time, and
• wherein, in the case where the lens tilt sensitivity sensed by the lens tilt sensitivity sensing unit is equal to or larger than a predetermined value, lens tilt correction is performed by tilting the objective lens so that a quality of a signal detected by the light detector is improved, and in the case where the lens tilt sensitivity sensed by the lens tilt sensitivity sensing unit is smaller than the predetermined value, the lens tilt correction is not performed.