To hold molten material in a high-temperature stereoscopic plasma forming space while preventing it from falling, and to actualize molecular dissociation while holding the material in the space for a long time.

Waste materials M charged into a treatment chamber 6 fall on the stack of resistance elements 11 as conductive porous particles stacked in a decomposition region, and the particulate resistance elements 11, 11 stacked in the decomposition region range between a pair of plasma arc electrodes 5, 5 to form a high-temperature stereoscopic plasma working space PS in a range of stack gaps between the resistance elements. The waste materials falling on the stack of the resistance elements collide with high-temperature plasma to be dissociated from one another while being exposed to plasma environment as long as they stay in the range of the stack of the resistance elements. All bonds of the materials excluding nuclear force are broken off, resulting in dissociation/fusion into a structural component level.

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