A keyboard is disposed on a front side of an upper surface of a housing and a display unit is disposed on a rear side of the housing upper surface. The housing houses therein a printer mechanics unit at a position just under the keyboard. The housing houses therein a control board on a back side of the display unit, the control board carrying a microcomputer thereon. The housing further houses therein a roll paper receptacle portion at a position just under the display unit and the control board, the roll paper receptacle portion accommodating removablely roll paper to be fed to the printer mechanics unit. According to this construction, the housing is not required to extend backward to ensure a mounting space for the roll paper receptacle portion, that is, the size of the device is reduced.