Patent ID: 7673830

Claim:
A tape cartridge comprising a reel wound with a tape, wherein a reel hole that fits with a drive shaft provided in a drive for rotationally driving the reel is formed in a surface of the reel, the drive shaft comprises a fitting shaft that fits with the reel hole and a guide shaft that enters the reel hole before the fitting shaft and has an outer dimension increasing toward the fitting shaft, a chamfered portion is formed so as to surround the outer periphery of the reel hole, the chamfered portion is constituted by an inclined face joining an inner peripheral face of the reel hole to the surface in which the reel hole is formed, and when the reel hole is viewed from a side facing an opening portion of the reel hole, a portion of the reel hole that fits with the fitting shaft has a polygonal shape, and the inclined face contains a portion in which the width of the inclined face varies along an edge of the polygonal shape.