Tape cartridge

1. A tape cartridge detachably installed 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 convex portion that is provided on the head cover and guides installation of the tape cartridge, the tape cartridge comprising:

a platen roller that receives power from the tape feeding mechanism portion and faces 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 that winds up the ink ribbon; and

a cartridge casing that accommodates the printing tape, the ink ribbon, the platen roller, and the winding up core,

wherein

the cartridge casing includes an insertion hole in which the head cover is inserted when the tape cartridge is installed on the cartridge installation portion,

the insertion hole includes a facing portion that faces the convex portion when the tape cartridge is installed on the cartridge installation portion, and

the facing portion is part of an inner wall of the insertion hole.

2. The tape cartridge according to claim 1 , wherein the facing portion is in contact with the convex portion.

3. The tape cartridge according to claim 2 , wherein the facing portion is positioned on a vertical line connecting the platen roller and the winding up core or in the vicinity of the vertical line.