A sprinkler head adapted for a specific yield temperature. The sprinkler head uses a heat-sensitive material composed of Sn in an amount of 0.1-2.0% by mass, Bi in an amount of 31-37% by mass and In for balance for a temperature range around 70-75° C. or a heat-sensitive material composed of Zn in an amount of 0.05-0.4% by mass, Bi in an amount of 43-55% by mass and In for balance for a temperature range around 90-95° C.