An optical disc device for reading information recorded on an optical disc medium under an operation condition corresponding to a value set with respect to a predetermined control parameter, the optical disc device comprising: a correction portion for correcting the value of the predetermined control parameter by repeatedly executing, while an operation of reading the information from the optical disc medium is being performed, a correction processing, wherein the optical disc device is adapted to start said correction processing at a timing at which the reading of information is started after execution of seek control according to an instruction given by a host to read information, and to carry out said correction processing in parallel to the information reading operation, and the predetermined control parameter is the SA parameter regarding spherical aberration correction of an objective lens; said correction processing comprises the steps of: setting as central value (Sc) the value of the SA parameter obtained when the correction processing is to be executed; obtaining two values by adding and subtracting a predetermined change amount (a) from the central value (Sc), which predetermined change amount (a) is set to be small so that the reading accuracy of the optical disc device is not affected; acquiring, with respect to each of said two values set for the predetermined control parameter, evaluation values calculated based on a reproduction signal for data reproduction of the information recorded on the optical disc medium obtained by the operation of reading of the information from the optical disc medium, respectively, wherein the evaluation values are jitter values; and updating the value of the predetermined control parameter based on the acquired evaluation values. a correction portion for correcting the value of the predetermined control parameter by repeatedly executing, while an operation of reading the information from the optical disc medium is being performed, a correction processing, wherein the optical disc device is adapted to start said correction processing at a timing at which the reading of information is started after execution of seek control according to an instruction given by a host to read information, and to carry out said correction processing in parallel to the information reading operation, and the predetermined control parameter is the SA parameter regarding spherical aberration correction of an objective lens; said correction processing comprises the steps of: setting as central value (Sc) the value of the SA parameter obtained when the correction processing is to be executed; obtaining two values by adding and subtracting a predetermined change amount (a) from the central value (Sc), which predetermined change amount (a) is set to be small so that the reading accuracy of the optical disc device is not affected; acquiring, with respect to each of said two values set for the predetermined control parameter, evaluation values calculated based on a reproduction signal for data reproduction of the information recorded on the optical disc medium obtained by the operation of reading of the information from the optical disc medium, respectively, wherein the evaluation values are jitter values; and updating the value of the predetermined control parameter based on the acquired evaluation values. setting as central value (Sc) the value of the SA parameter obtained when the correction processing is to be executed; obtaining two values by adding and subtracting a predetermined change amount (a) from the central value (Sc), which predetermined change amount (a) is set to be small so that the reading accuracy of the optical disc device is not affected; acquiring, with respect to each of said two values set for the predetermined control parameter, evaluation values calculated based on a reproduction signal for data reproduction of the information recorded on the optical disc medium obtained by the operation of reading of the information from the optical disc medium, respectively, wherein the evaluation values are jitter values; and updating the value of the predetermined control parameter based on the acquired evaluation values.