| 摘要 |
PROBLEM TO BE SOLVED: To provide a fire alarm capable of improving the inside appearance of a fire alarm installed space and suppressing a rise of cost. SOLUTION: Only a lower case 10 storing a sensor 30 is exposed to an indoor space in this fire alarm 1. Consequently, a part exposed to the indoor space can be reduced to improve the inside appearance of a room. Moreover, since an upper case 20 covering an electric circuit part is positioned in a space above a ceiling and is not exposed to the indoor space, it is unnecessary to miniaturize the electric circuit part for improving the inside appearance of the room, and high density mounting is unnecessary to suppress a rise of cost.
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