| 摘要 |
In a recording tape cartridge, at a reel which is accommodated within a case, a magnetic tape is wound around an outer peripheral portion of a reel hub, and a reel gear is provided coaxially and annularly at an end surface of the reel hub. An annular convex portion projects coaxially from the end surface of the reel hub. An end surface of the annular convex portion is a reference surface which is orthogonal to an axis of the reel. When the magnetic tape is used, the reference surface abuts a positioning surface of a drive device, the reel is positioned in an axial direction, and the reel rises up within the case. The reel rotates around the axis due to driving force of a driving gear which meshes with the reel gear.
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