It is the objects of this invention to keep the middle plate sealed stably and securely in the refill case and thereby to maintain safely the quality of the cosmetic item inside the middle plate with no regard to the sealing of the middle plate and to make the middle plate replaceable at the user’s own discretion. The first mixing chamber includes three inlet ports for feeding hot gas into the first mixing chamber, feeding cold gas into the first mixing chamber and feeding cold gas into the second mixing chamber, respectively. A display screen in data-communication with the microprocessor presents information for user observation based upon data output from the microprocessor.