The present disclosure is directed to a slitter scorer apparatus which slit and flutes, along a running direction, long and flat materials which are successively delivered. More particularly, the present disclosure is concerned with a slitter scorer apparatus comprising a rotary shear which cuts the flat materials at a right angle direction with their running direction, two slitter scorers which are vertically placed downstream of the rotary shear, a front guide which guides the materials from the exit of the rotary shear to either entrance of the two slitter scorers or to an opening entrance between the two slitter scorers, and a rear guide which guides the material from either exit of the two slitter scorers or from an opening entrance between the two slitter scorers to the next process step.