To provide a blue-violet laser photosensitive composition, having high sensitivity to blue-violet laser light, high safelight properties of a photosensitive composition layer formed on a temporary support film and high resolution, and to provide an image forming material, an imaging material and a method for forming an image thereon.

The blue-violet laser photosensitive composition contains (A) an ethylenically unsaturated compound, (B) a photopolymerization initiator and (C) a sensitizer, having a specified structural formula and shows the maximum peak of spectral sensitivity in a 390 to 430 nm wavelength region, and ≥5% transmittance T405 for light at 405 nm wavelength, when a photosensitive composition layer of 20 μm film thickness is formed.