Disclosed is a photocatalyst member that, even when used in a form where warm water resistance and acid resistance are required, can exert a photocatalytic decomposition ability over a long period of time. The member having a photocatalytic decomposition ability comprises: a base material and photocatalytic metal oxide particles immobilized on the base material, the base material having a surface treated with silicification flame treatment, the photocatalytic metal oxide particles are immobilized with a silicon-type binder on the base material on the surface treated with silicification flame treatment.
