| 摘要 |
In a magnetic tape cartridge ( 1 ) having a metal plate ( 25 ) at the central portion of the bottom surface of a reel hub ( 21 ) with a reel gear ( 24 ) being defined around its periphery, the metal plate ( 25 ) is disposed in a manner such that the outer periphery of the metal plate ( 25 ) is positioned under the inner facing surface of the reel gear ( 24 ). As a result, occurrence of a sink mark during molding at a portion where the reel gear ( 24 ) is formed and deformation of the reel hub ( 21 ) due to tape widing tention are prevented.
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