A pattern exposure device comprising: a holding unit configured to hold a photosensitive material; an exposure head configured to output patterned light toward said photosensitive material; a measurement unit configured to measure the position of said photosensitive material held by said holding unit; and a focus control unit configured to adjust an imaging position of said patterned light in accordance with the position of said photosensitive material, wherein said exposure head includes: a spatial light modulator including a plurality of modulation elements configured to form patterned light by performing spatial light modulation on light output from a light source; a first imaging optical system including a first lens and a second lens disposed on an optical path of patterned light output from said spatial light modulator, said second lens being telecentric on an image side; a micro lens array including a plurality of micro lenses configured to condense said patterned light that has passed through said second lens of said first imaging optical system; a second imaging optical system disposed on an optical path of said patterned light that has passed through said micro lens array and configured to image said patterned light; characterized by a lens moving unit configured to integrally move said second lens and said micro lens array in directions toward and away from said first lens; wherein said focus control unit is configured to adjust said imaging position of said patterned light by controlling operation of said lens moving unit. a holding unit configured to hold a photosensitive material; an exposure head configured to output patterned light toward said photosensitive material; a measurement unit configured to measure the position of said photosensitive material held by said holding unit; and a focus control unit configured to adjust an imaging position of said patterned light in accordance with the position of said photosensitive material, wherein said exposure head includes: a spatial light modulator including a plurality of modulation elements configured to form patterned light by performing spatial light modulation on light output from a light source; a first imaging optical system including a first lens and a second lens disposed on an optical path of patterned light output from said spatial light modulator, said second lens being telecentric on an image side; a micro lens array including a plurality of micro lenses configured to condense said patterned light that has passed through said second lens of said first imaging optical system; a second imaging optical system disposed on an optical path of said patterned light that has passed through said micro lens array and configured to image said patterned light; characterized by a lens moving unit configured to integrally move said second lens and said micro lens array in directions toward and away from said first lens; wherein said focus control unit is configured to adjust said imaging position of said patterned light by controlling operation of said lens moving unit. a spatial light modulator including a plurality of modulation elements configured to form patterned light by performing spatial light modulation on light output from a light source; a first imaging optical system including a first lens and a second lens disposed on an optical path of patterned light output from said spatial light modulator, said second lens being telecentric on an image side; a micro lens array including a plurality of micro lenses configured to condense said patterned light that has passed through said second lens of said first imaging optical system; a second imaging optical system disposed on an optical path of said patterned light that has passed through said micro lens array and configured to image said patterned light; characterized by a lens moving unit configured to integrally move said second lens and said micro lens array in directions toward and away from said first lens; wherein said focus control unit is configured to adjust said imaging position of said patterned light by controlling operation of said lens moving unit.