| 摘要 |
PROBLEM TO BE SOLVED: To surely lead the tones of a sound producing body within a case, such as electric connection box, toward a required direction. SOLUTION: A guide space for guiding the tone 11 of the sound producing body 4 is formed to face the sound producing body 4 of the case 2. The guide space is delineated by guide ribs 5. The case 2 may also be provided with an inclined reflection wall facing the hole part 7 so as to face the sound producing body 4. The case may also be independently provided with the inclined reflection wall facing the hole part so as to face the sound producing body in the case. The hole part is a slit hole 7 formed by zigzag grid parts 131 to 133.
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