A thermal transfer printer includes a label feeding roller driving unit, a ribbon roll-up driving unit, a ribbon feeding roller, a ribbon feeding roller driving unit, and a controller. The ribbon feeding roller has an adhesive layer on its surface and is rotated to feed the ink ribbon while holding the ink ribbon on the adhesive layer.

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.

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.

A tape cassette includes: a tape roll in which a tape is wound; a ribbon spool about which an ink ribbon is wound; a housing having a first opening; a first gear; and a second gear configured to operate in response to an operation of the first gear. The ribbon spool is rotatable about a first axis extending in a first direction. The housing includes: a partition plate partitioning an internal space of the housing into a first space in which the tape roll and the ribbon spool are positioned and a second space in which the first gear and the second gear are positioned; and an arm having a second opening allowing the tape and the ink ribbon to be discharged through the second opening to an outside of the housing. The second gear is exposed to the outside of the housing through the first opening.

A tape cassette includes: a tape roll in which a tape is wound; a ribbon spool about which an ink ribbon is wound; a housing having a first opening; a first gear; and a second gear configured to operate in response to an operation of the first gear. The ribbon spool is rotatable about a first axis extending in a first direction. The housing includes: a partition plate partitioning an internal space of the housing into a first space in which the tape roll and the ribbon spool are positioned and a second space in which the first gear and the second gear are positioned; and an arm having a second opening allowing the tape and the ink ribbon to be discharged through the second opening to an outside of the housing. The second gear is exposed to the outside of the housing through the first opening.