A fire detector base , comprising: a pedestal configured to attach thereto a detector body , the pedestal including a bottom wall , and the detector body including an electric circuit for detecting fire; external connection terminals configured to be electrically connected to an external wiring , the external connection terminals being fixed to the bottom wall ; internal terminals to which the electric circuit is electrically connected, the internal terminals being fixed to the bottom wall ; external connection terminal blocks ; and internal terminal blocks , the bottom wall includes a first bottom portion and a second bottom portion facing the first bottom portion , each external connection terminal block is protruded upward from the second bottom portion and houses one external connection terminal , each internal terminal block is fixed to the second bottom portion and houses one internal terminal , the second bottom portion holding the external connection terminals and the internal terminals , the first bottom portion covering the external connection terminals , the respective internal terminals corresponding to the external connection terminals in one-to-one, each of the internal terminals being electrically connected to a target external connection terminal that is one corresponding to each internal terminal noted, of the external connection terminals , in each of the internal terminals , a distance (L1, L2, or L3) from each internal terminal to the target external connection terminal being shorter than a distance (L61, L62; L61, L63; or L62, L63) from each internal terminal to any other one of the internal terminals , and shorter than a distance (L51, L52; L51, L53; or L52, L53) from the target external connection terminal to any other one of the external connection terminals . a pedestal configured to attach thereto a detector body , the pedestal including a bottom wall , and the detector body including an electric circuit for detecting fire; external connection terminals configured to be electrically connected to an external wiring , the external connection terminals being fixed to the bottom wall ; internal terminals to which the electric circuit is electrically connected, the internal terminals being fixed to the bottom wall ; external connection terminal blocks ; and internal terminal blocks , the bottom wall includes a first bottom portion and a second bottom portion facing the first bottom portion , each external connection terminal block is protruded upward from the second bottom portion and houses one external connection terminal , each internal terminal block is fixed to the second bottom portion and houses one internal terminal , the second bottom portion holding the external connection terminals and the internal terminals , the first bottom portion covering the external connection terminals , the respective internal terminals corresponding to the external connection terminals in one-to-one, each of the internal terminals being electrically connected to a target external connection terminal that is one corresponding to each internal terminal noted, of the external connection terminals , in each of the internal terminals , a distance (L1, L2, or L3) from each internal terminal to the target external connection terminal being shorter than a distance (L61, L62; L61, L63; or L62, L63) from each internal terminal to any other one of the internal terminals , and shorter than a distance (L51, L52; L51, L53; or L52, L53) from the target external connection terminal to any other one of the external connection terminals . <EOS>