When a margin paper constituting a margin between pictured formed sheets, on which pictures have been formed, is cut by a cutter, it is received in a casing. The number of times, in which cutting means cuts a number of sheets to avoid overflowing of the margin paper received in the casing, is beforehand set as a set value, and the number of times, in which the cutter cuts a roll paper, is counted. When a count value reaches the set value, a control unit turns the casing so that an upper opening of the casing is directed downward, and causes the margin paper in the casing to be ejected. When a predetermined period of time has elapsed, the casing is again turned to be returned to an original state. The number of times as counted is reset and counting is again performed.