Patent ID: 6857591

Claim:
A recording tape cartridge for rotatably accommodating a reel on which a recording tape is wound, the reel comprising: a hollow hub on which the recording tape can be wound, the hub including two ends; a first annular flange welded at one end of the hub for retaining one width-direction end of the recording tape wound on the hub; and a second annular flange welded at the other end of the hub for retaining another width-direction end of the recording tape wound on the hub, wherein the one end of the hub comprises a collar portion including, along a circumferential direction thereof, a surface for welding to the first annular flange, the surface having been provided with a first weld boss protruding therefrom, and the other end of the hub comprises a stepped portion including, along a circumferential direction thereof, a surface for welding to the second annular flange, the surface having been provided with a second weld boss protruding therefrom.