An incubator includes an incubator main body, a baby accommodation chamber disposed in the incubator main body and capable of being shielded from external air, and a humidifier disposed in the incubator main body so as to generate steam for supplying humidified air into the baby accommodation chamber. The humidifier has a connection portion to which a water supply hose is connectable so as to supply water for generating the steam from a water supply container located outside the incubator main body. In addition, the humidifier includes a humidifying tank which stores the water for generating the steam, a water supply port portion which supplies the water into the humidifying tank in communication with the connection portion, and a float valve which opens and closes the water supply port portion by moving upward and downward in response to a water level of the water stored inside the humidifying tank.
