The main object of the present invention is to provide a photocatalyst composition and a photocatalyst containing layer showing a high activity in a short period of time, and a pattern formed body using the photocatalyst containing layer.To attain the object, the invention provides a photocatalyst composition containing at least a photocatalyst, characterized by including a portion with the signal intensity of the electron spin resonance spectrum derived from the hydroxy radical increased to 1,000 times or more in 1 second within 600 seconds of the start of the ultraviolet ray irradiation at the time of measuring the electron spin resonance spectrum while irradiating the ultraviolet ray.