1. A tape cartridge for detachable installation in a tape printing apparatus having a cartridge installation portion on which the tape cartridge is installed, a tape feeding mechanism portion that feeds a printing tape from the installed tape cartridge, a ribbon feeding mechanism portion that feeds an ink ribbon in synchronization with the feeding of the printing tape, a printing head portion that performs printing on the printing tape and is configured to be movable between a printing position and a retracting position, a head cover that is provided on the cartridge installation portion in a projecting manner, covers the printing head while allowing the printing head to move, and has a plurality of corners, and a first convex portion and a second convex portion that are provided on the head cover and guide installation of the tape cartridge, the tape cartridge comprising:a platen roller configured to receive power from the tape feeding mechanism portion and face the printing head portion in a state where the printing tape and the ink ribbon are disposed between the platen roller and the printing head at the printing position;
a winding up core configured to wind up the ink ribbon;
a cartridge casing that accommodates the printing tape, the ink ribbon, the platen roller, and the winding up core,
an insertion hole on the cartridge casing, the insertion hole being configured to have the head cover inserted therein when the tape cartridge is installed on the cartridge installation portion;
a first inner wall of the insertion hole disposed on a side of an accommodation portion of the printing tape;
a second inner wall of the insertion hole provided on a side of the winding up core;
a first concave portion on the first inner wall and configured to face the first convex portion when the tape cartridge is installed on the cartridge installation portion; and
a second concave portion on the second inner wall and configured to face the second convex portion when the tape cartridge is installed on the cartridge installation portion.