An image formation device having a paper feed member which separates on a one-by-one basis sheets taken out of a paper feed tray by a take-out roller and feeds the separated sheets downstream in a sheet carrying direction; an upstream side sheet carrying path which the sheets are carried to an image recording position and which has a sheet size detecting path; an image recording member which records an image; a downstream side sheet carrying path which carries recorded sheets to an eject tray; and a sheet inverting path for inverting one side recorded sheets, and further having a sheet returning path for returning one side recorded sheets to the upstream side sheet carrying path; a sheet size detecting part which detects sheet sizes; an image magnification computing part which computes an image magnification, and an image recording member drive data output part which supplies image recording member drive data.