| 摘要 |
A main body case (9) of an audio unit has an output opening (43) that outputs sound from a sound source to a space that is interposed between an upward-side main wall (33) and a downward-side main wall (34). The main body case (9) includes a front-side main wall (41) that prevents the infiltration of water droplets into the output opening (43) and that guides to a back side (B) the sound that is outputted from the output opening (43), and includes a back-side main wall (35) that reflects to a front side (F) the sound that is outputted from the output opening (43). A first space (51) that is between the front-side main wall (41) and the back-side main wall (35), a second space (52) that is surrounded by a left side-surface (41C) of the front-side main wall, by the back-side main wall (35), by the upward-side main wall (33), and by the downward-side main wall (34), and a third space (53) that is surrounded by a right side-surface (41D) of the front-side main wall (41), by the back-side main wall (35), by the upward-side main wall (33), and by the downward-side main wall (34) communicate at respective back end parts thereof along a left-right direction (Y). |
