Patent ID: 7106444

Claim:
A position measuring device comprising a calculation unit which calculates mark position information relating to a position of a mark by using a mark signal obtained by irradiating a detection beam onto the mark formed on an object, wherein the calculation unit includes a processing unit which performs predetermined processing on predetermined information to be used when calculating the mark position information, and generates a plurality of processing information, and the position measuring device further comprises a correction unit which is electrically connected to the calculation unit and corrects calculation results from the calculation unit based on a difference between a plurality of the mark position information calculated by the calculation unit using the plurality of processing information, wherein of the plurality of mark position information, if a first position information is termed CH, a second position information is termed CL, and a predetermined coefficient is termed R (R>0), the first position information CH is calculated from a higher resolution signal than the second position information CL, and the correction unit performs corrections based on a result determined by (CL−CH)×R.