An interior building material, interior building panel and interior building sheet that are capable of satisfactorily effecting decomposition and removal of toxic chemical substances and shortening the work period. A mixture of pulverized diatom earth and pulverized quartz porphyry is used as an interior building material or as a raw material for interior building panel or interior building sheet. In the mixture, quartz porphyry is used in an amount larger than that of diatom earth. For example, tourmaline is used as the quartz porphyry. According to necessity, these base components may be used in combination with particulate acrylic resins as aggregate or binder, silver base antibacterial agents, etc.
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