| 摘要 |
A disc tray of a disc cartridge includes: a bottom plate in which a tray opening for allowing disc access is formed; a ring-like sidewall that is formed to stand on the outer peripheral portion of the bottom plate; an arc-like opening connecting portion provided to serve as a reinforcement that is continuously formed from a sidewall over a tray opening in the bottom plate; and a convex portion that projects from one circumferential end of the opening connecting portion outward in the radial direction of the disc tray along the sidewall and forms a part of a concave portion for engaging with a drive-side member when the disc tray is rotated, the convex portion is hollow or partially thinned, and a gap S is formed at least between the end of the convex portion and the outer circumferential surface of the opening connecting portion.
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