<p>A fire distinguishing device comprises: a detection means for detecting an outbreak of fire; a fire presence/absence distinguishing means for distinguishing the presence/absence of the fire; and a cumulative time determining means for determining the cumulative time required for the fire presence/absence distinguishing means to distinguish the presence/absence thereof. The cumulative time determining means distinguishes the environment type of environment in which the detection means is placed or the phenomenon type of phenomenon detected by the detection means and further determines the cumulative time depending on the distinguished environment type or phenomenon type.</p>
