To provide a processing device and a processing method for a used disposable diaper capable of incinerating used disposable diapers hygienically and easily.;Provided is a used disposable diaper processing device which includes a freezing device freezing a used disposable diaper which contains a water-absorbent polymer between a non-water-permeable cover sheet and water-permeable non-woven fabric, a vacuum device evacuating a space area containing the frozen used disposable diaper by lowering an air pressure until water content contained in the used disposable diaper can be sublimated, and a sublimation progressing device promoting sublimation of the water content in the used disposable diaper which is frozen and arranged in the space area in a vacuum state.
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