A printer includes a mainframe (10) including a front face part (11) that has an opening (13) through which a recording medium passes; a guide unit (30) connected to the mainframe (10) on a first side of the front face part (11); a printer mechanism unit (20) configured to perform printing on the recording medium, and connected to the mainframe (10) on a second side of the front face part (11) opposite to the first side thereof; an arm unit (50) having a first end connected to the mainframe (10); and a shaft unit (70) configured to hold a roll of the recording medium, and connected to a second end of the arm unit (50), wherein the guide unit (30) is configured to guide the recording medium so as to feed the recording medium to the printer mechanism unit through the opening (13) of the front face part of the mainframe (10).
