Patent ID: 7881013

Claim:
A recording tape cartridge comprising: a reel including a hub around which recording tape is wound and at least part of the hub being formed by a resin; and a case that rotatably houses the reel, wherein in a state where tension of 15.7 MPa is applied to the recording tape for 50 hours after tension of 0.6 MPa has been applied thereto for 30 minutes in a longitudinal direction of the recording tape in a 50° C. environment, when x (%) represents the creep deformation ratio in the width direction of the recording tape excluding instantaneous strain resulting from the tension of 15.7 MPa and y (MPa) represents the rigidity in the radial direction of the hub, then x and y satisfy the relationship of y≧87.3 exp (21.6x) and x>0.1.