Abstract: A TOC component removing apparatus of the present invention is for removing TOC components contained in ultrapure water or pure water, including a treatment tank 2 into which the ultrapure water or the pure water is introduced, a plurality of spherical catalyst particles 3 of which surfaces are photocatalyst, a tabular translucent holding body 4 which holds the catalyst particles 3 on one surface 31a, and an ultraviolet-ray light source 5 which is arranged near the translucent holding body 4 and radiates ultraviolet rays with a wavelength of 254 nm.