A method efficiently changes the state of an object at low cost and in a short time, in which a state change control device changes the state of an object by bringing the object into contact with an ice slurry to cause a temperature change to the object. The device includes an ice slurry contact part that brings the object and the ice slurry into contact with each other at a predetermined relative speed and changes the temperature of the object, and an ice slurry supply part that supplies the ice slurry to the ice slurry contact part.