Abstract: A sprinkler head having a first housing connected to a water supply pipe disposed inside a building ceiling. The sprinkler head includes a second housing coupled to the first housing and fixed to the ceiling surface. A deflector is adhered to the first housing for spraying water by being detached from the first housing. A locking unit is locked inside the second housing for maintaining the sealing state between the deflector and the second housing, and a heat responding unit is exposed to outside of the ceiling for sensing heat at the time of a fire occurrence and thus releasing a locking of the locking unit.