will arise between the normal displacement of the reflective surface when the variable mirror is set in the normal state with no error and the displacement of the actually set reflective surface therefore merely using the variable mirror involves difficulties in obtaining sufficient image blur compensation accuracy with this embodiment information concerning the displaced state of the reflective surface 2 a of the variable mirror 2 is produced on the basis of the imaged positions on the imaging unit 4 of the marks 2 c formed on the variable mirror 2 and the compensation unit 7 produces correction information for correcting the displacement error of the reflective surface 2 a from the information concerning the displaced state and then corrects a drive signal supplied from the drive unit 3 to the control electrodes 2 b of the variable mirror 2 using the correction information thus with this embodiment since the drive signal is corrected using the correction information produced by the compensation unit 7 it is possible to obtain sufficient image blur compensation accuracy even in the presence of the individual difference among variable mirrors and variable mirror mounting errors in addition information concerning the displaced state of the reflective surface 2 a of the variable mirror 2 is produced on the basis of the imaged positions on the imaging unit 4 of the marks 2 c formed on the variable mirror 2 thus allowing information concerning the displaced state to be obtained without using dedicated means and the device structure to be simplified a.