Optical disc device and recording and reproduction device

An optical disc device that records or reproduces information on or from an optical disc by irradiating the optical disc with laser light, the optical disc device comprising:

• an optical pickup including:
• a laser light source that emits the laser light,
• an objective lens that focuses the laser light emitted from the laser light source onto the optical disc, and
• a light receiving element that receives reflected light from the optical disc, and performs photoelectric conversion on the reflected light received to generate a received-light signal, amplifies the received-light signal to an amplified received-light signal at a predetermined amplification factor, and outputs the amplified received-light signal;
• a light amount signal generator that generates a light amount signal indicating a light amount of the reflected light from the optical disc, based on the amplified received-light signal from the light receiving element;
• and
• a dirt determiner that determines that dirt is present in the optical pickup, when a peak level of the light amount signal is less than a first threshold, and controls the light receiving element to increase a peak level of the amplified received-light signal by increasing the predetermined amplification factor.