| 摘要 |
In a magnetic tape cassette, a window opening 2 covered with a window member 3 is formed in an upper half 1. At a peripheral portion of the window opening 2, a fixing surface 4 for fixing the window member 3 thereto is formed; and at a portion surrounding the fixing surface 4, a slant 6 is formed. Further, a build-up portion 8 is formed at the portion surrounding the fixing surface 4 and at a corner portion A on the opening portion side of the cassette case through which a magnetic tape passes. At a peripheral portion of the window member 3, a plurality of welded ribs 10 is formed. And, a weld line produced by the resin molding of the window member 3 is located on the welded rib 10.
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