A tape cartridge attachably/detachably installed on a cartridge installation portion of a tape printing apparatus having the cartridge installation portion and a press switch, the cartridge installation portion having an installation base portion and an installation peripheral wall portion surrounding the installation base portion and allowing the tape cartridge to be installed thereon, the press switch having a stem projecting in a direction crossing an installation direction and provided on the installation peripheral wall portion , the tape cartridge comprising: a detected portion that is provided on an outer peripheral surface of the tape cartridge and corresponds to the stem when the tape cartridge is installed on the cartridge installation portion , wherein the detected portion has an installation guide slant surface that presses the stem when the tape cartridge is installed on the cartridge installation portion characterized in that the cartridge installation portion allows n types (where n is an integer of two or more) of the tape cartridges having a different thickness in the installation direction to be installed thereon, the press switch includes n press switches, each of which is different in distance from the installation base portion to a direction opposite to the installation direction, on the installation peripheral wall portion , the detected portion includes n detected portions on the outer peripheral surface of the tape cartridge , and one or more and (n - 1) or less of the n detected portions and the detected portions different in number according to the thickness of the tape cartridge further have a removing guide slant surface that releases pressing of the stem when the tape cartridge is installed on the cartridge installation portion and presses the stem when the tape cartridge is removed from the cartridge installation portion . a detected portion that is provided on an outer peripheral surface of the tape cartridge and corresponds to the stem when the tape cartridge is installed on the cartridge installation portion , wherein the detected portion has an installation guide slant surface that presses the stem when the tape cartridge is installed on the cartridge installation portion characterized in that the cartridge installation portion allows n types (where n is an integer of two or more) of the tape cartridges having a different thickness in the installation direction to be installed thereon, the press switch includes n press switches, each of which is different in distance from the installation base portion to a direction opposite to the installation direction, on the installation peripheral wall portion , the detected portion includes n detected portions on the outer peripheral surface of the tape cartridge , and one or more and (n - 1) or less of the n detected portions and the detected portions different in number according to the thickness of the tape cartridge further have a removing guide slant surface that releases pressing of the stem when the tape cartridge is installed on the cartridge installation portion and presses the stem when the tape cartridge is removed from the cartridge installation portion . <EOS>