A tape printing device or the like in which the loading of a tape cartridge can be detected and in which the misalignment of the loaded tape cartridge can be restrained at the same time, is provided. A tape printing device includes: a cartridge loading section in which a tape cartridge is loaded in an unloadable manner; a push switch which is provided in the cartridge loading section and detects the loaded tape cartridge. The push switch has a stem which is energized in a protruding direction by a build-in spring, and the stem in an actuated state energizes the loaded tape cartridge in a direction intersecting with a loading direction.