Correction means and correction cassette

The present invention provides a calibration device and a calibration method for the cassettes. Correction means comprises a first, a second set of diagonal correction unit, a first correction unit disposed adjacent to the first sidewall and a second sidewall cassettes intersection, a second correction unit provided in the cassette adjacent the third intersection and fourth sidewalls, wherein the first, respectively the second correction unit includes a base, a transmission mechanism, a first portion and a second correcting section correcting, when the transmission mechanism drives the first correction, the second correction section a relative movement reducing the gap between the two, to be corrected by the first and second correction cassette holding portion. Defect correction failure can be prevented when the present invention is a cassette having a large deviation angle to increase productivity.