PURPOSE: To easily set not only an arbitrary copying magnification but also various kinds of fixing copying magnifications with only a slide bar by providing a section where a set value of the copying magnification changes in proportion to a moving amount of a lever and a section where the set value doesn's change when the lever moves.

CONSTITUTION: The copying magnification is set by operating a slide lever 35 which interlocks with a variable resistance, that is, it is set by the operation of the variable resistance by an operator and the manipulated variable is converted into a voltage value which is inputted into an analog input board PA27 of a CPU25. A copying magnification set means is provided which is composed of the area where the lever 35 can move which is equipped with the section where the set value of the copying magnification change in proportion to the moving amount of the lever 35 and the section where the set value doesn's change when the lever 35 moves. Thus operation only with a copying magnification setting lever of the slide lever system can easily set the fixing magnification as well as the arbitrary magnification.