A tape printing device includes a cartridge loading section where a tape cartridge having a platen roller and a portion to be guided is loaded in an unloadable manner; two recess portions in which fingers for gripping the tape cartridge are inserted; a platen support shaft inserted in the platen roller; and a guide pin inserted in the portion to be guided. The guide pin is situated on a side opposite to the platen support shaft across an imaginary line connecting the two recess portions and is arranged at a site where a distance from the recess portion at a position farther from the first insertion shaft, of the two recess portions, is shorter than a distance from the recess portion at a position closer to the platen support shaft.