Provided is a printer device comprising: a frame having a frame back part; an opening/closing arm comprising an arm rotation shaft and supported by the frame so as to rotate around the arm rotation shaft relative to the frame; a platen roller rotatably supported by the opening/closing arm or the frame; a print head provided between the frame back part and the platen roller to perform printing on recording paper held between the print head and the platen roller; and a first biasing spring provided between the frame back part and the print head to bias the print head against the frame back part toward the platen roller side.
