To provide N- and/or S-doped tubular titanium oxide particles which exhibit high photocatalytic performance under natural light including visible light or under irradiation with light from an artificial light source.

The N- and/or S-doped tubular titanium oxide particles are characterized in that the content of N is within a range of 0.1-5 wt.% expressed in terms of N, the content of S is within a range of 0.2-6 wt.% expressed in terms of S, the average outer tube diameter (Dout) is within a range of 5-40 nm, the average inner tube diameter (Din) is within a range of 4-20 nm, the average tube thickness is within a range of 0.5-10 nm, the average length (Lp) is within a range of 25-1,000 nm, and the aspect ratio (Lp/Dout) is within a range of 5-200.