Image recording apparatus

The present invention supplied an excellent printer which can print on a thick print medium without deformation of character. In the printer, a tension spring is respectively furnished on both ends of a carriage shaft which slidably supports a carriage carrying a print head, and pulls the carriage shaft upward; a carriage shaft gear is respectively fixed the both ends of the carriage shaft and engages with rack furnished on a side frame; the carriage shaft only moves up and down; and when a print medium P whose thickness is a predetermined thickness or over is fed, the carriage does not incline, but evenly moves upward through rotation of the carriage shaft gear.