A tape printing device comprising: a cartridge loading section in which a tape cartridge can be loaded in an unloadable manner; a first output unit which is provided in the cartridge loading section and outputs a forward rotational force to feed a print tape of the tape cartridge when it is loaded; a second output unit which is provided in the cartridge loading section and outputs a reverse rotational force to take up an ink ribbon of the tape cartridge when it is loaded; a print head unit provided in the cartridge loading section which is adapted to perform printing on the print tape; a device-side abutting portion which is provided in the cartridge loading section and abuts against the tape cartridge when it is loaded, so as to resist the rotational forces generated on the tape cartridge by the first output unit and the second output unit, characterized in that a head cover is provided which covers the print head unit, and wherein the device-side abutting portion is provided in a protruding manner in a corner of the head cover and is adapted to abut against a corner of an opening circumferential wall portion of the tape cartridge where the head cover is to be inserted, the print head unit has a print head and a swivel support shaft which supports the print head in such a way as to be able to swivel between a printing position and a retreat position, the head cover has a first cover sidewall and a second cover sidewall which cover the side of the swivel support shaft and meet each other, and the device-side abutting portion is provided in a protruding manner in a corner where the first cover sidewall and the second cover sidewall meet each other, the device-side abutting portion has, in the corner, a first abutting protrusion provided in a protruding manner on the first cover sidewall, and a second abutting protrusion provided in a protruding manner on the second cover sidewall, the first abutting protrusion may be fitted with a first abutting recess of the cartridge-side abutting portion, and the second abutting protrusion may be fitted with a second abutting recess on the cartridge-side abutting portion. a cartridge loading section in which a tape cartridge can be loaded in an unloadable manner; a first output unit which is provided in the cartridge loading section and outputs a forward rotational force to feed a print tape of the tape cartridge when it is loaded; a second output unit which is provided in the cartridge loading section and outputs a reverse rotational force to take up an ink ribbon of the tape cartridge when it is loaded; a print head unit provided in the cartridge loading section which is adapted to perform printing on the print tape; a device-side abutting portion which is provided in the cartridge loading section and abuts against the tape cartridge when it is loaded, so as to resist the rotational forces generated on the tape cartridge by the first output unit and the second output unit, characterized in that a head cover is provided which covers the print head unit, and wherein the device-side abutting portion is provided in a protruding manner in a corner of the head cover and is adapted to abut against a corner of an opening circumferential wall portion of the tape cartridge where the head cover is to be inserted, the print head unit has a print head and a swivel support shaft which supports the print head in such a way as to be able to swivel between a printing position and a retreat position, the head cover has a first cover sidewall and a second cover sidewall which cover the side of the swivel support shaft and meet each other, and the device-side abutting portion is provided in a protruding manner in a corner where the first cover sidewall and the second cover sidewall meet each other, the device-side abutting portion has, in the corner, a first abutting protrusion provided in a protruding manner on the first cover sidewall, and a second abutting protrusion provided in a protruding manner on the second cover sidewall, the first abutting protrusion may be fitted with a first abutting recess of the cartridge-side abutting portion, and the second abutting protrusion may be fitted with a second abutting recess on the cartridge-side abutting portion.