To provide a toxic substance detoxifying material which can be detoxified by decomposing the toxic substance and to provide a method for detoxifying the toxic substance by using the toxic substance detoxifying material.

The toxic substance detoxifying material for detoxifying by decomposing the toxic substance contains a lamellar phosphate having a photocatalytic function. The method for detoxifying the toxic substance comprises a step of irradiating the toxic substance detoxifying material with ultraviolet rays having ≤280 nm wavelength in the coexistence of the toxic substance to decompose the toxic substance.