A detector base has a base block (1) for attaching a fire detector (4), the base block including an opening (2) which is located partially outside of the periphery of the detector (4) when the detector is attached, a locking spring (3) having one end (3a) secured to the base block (1) and the other end (3c) being a free end, the spring (3) being placed in a position facing outwards via the opening (2), and engaging means (6) provided for a movable portion of the locking spring (3) and being engaged with the detector. A pair of connecting terminals (7, 8) having the same polarity is fixed on the base block (1) so as to be located spaced apart from each other. The connecting terminals (7, 8) have small holed (7a, 8a), and a short-circuiting device (10) is provided for electrically connecting the both connecting terminals (7, 8) by inserting both ends (11, 12) of the short-circuiting device (10) into the small holes (7a, 8a) formed on the pair of connecting terminals such that they can be detached again from each other. IMAGE
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