Patent ID: 8888032

Claim:
A tape cartridge comprising: a first flange member that includes a first hub portion and a first flange portion extending outward from the first hub portion; a second flange member that includes a second hub portion slidably fitting to the first hub portion and a second flange portion extending outward from the second hub portion and facing the first flange portion, and forms a reel winding a tape in a combination with the first flange member; a biasing member that biases the first flange member to the second flange member side; an engagement portion in which a first through-hole is opened and that is located on a back side of a surface of the second flange portion facing the first flange portion and the engagement portion that engages with a drive unit included in an external tape driving device; a housing that includes a top plate and a bottom plate to which an opening portion from which the engagement portion is exposed is provided, and houses the reel so that the first flange member is located on the top plate side and the second flange member is located on the bottom plate side; and a first protrusion that is provided to the first hub portion so as to be exposed from a surface of the engagement portion in the second flange portion via the first through-hole when the drive unit does not engage with the engagement portion, the first protrusion that is provided to slide inside the first through-hole against a biasing force of the biasing member by contacting the drive unit and space the first flange portion and the second flange portion apart from each other against the biasing force of the biasing member when the drive unit engages with the engagement portion.