An optical disk device includes an optical pickup, a measurement unit and a control unit. The optical pickup is configured to emit laser light to a disk to record data. The measurement unit is operatively coupled to the optical pickup to measure a peak value of a RF signal outputted from the optical pickup, a fluctuation amplitude of the peak value of the RF signal and an amplitude of the focus drive signal of the optical pickup. The control unit is operatively coupled to the measurement unit to correct the peak value of the RF signal measured during a second recording based on the fluctuation amplitude of the peak value of the RF signal and the amplitude of the focus drive signal measured during a first recording prior to the second recording.