| 摘要 |
A portable housing case particularly for use in receipt of a prescribed musical instrument is basically constituted by a pair of a base board and a top board, which are assembled together using hinges to form a shell, which can be freely closed or opened. The base board has a band-shaped hollow elongated in a longitudinal direction, and the top board has a band-shaped projection elongated in a longitudinal direction, wherein they are formed in prescribed dimensions to be engaged with each other when the case is stacked with the other case. Thus, it is possible to establish a stable stacking relationship between portable housing cases, regardless of sizes and shapes.
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