Abstract: A highly stable photopolymerizable composition which is highly photosensitive to visible light, which can be hardened using a visible light laser, such as an argon laser, which provides excellent contrast between non-irradiated portions and the substrate under red light, and, moreover, which provides excellent contrast between the portions irradiated by the laser and the portions not irradiated. The photopolymerizable composition consists of 100 parts by weight of a resin which is hardenable under visible light having an irradiation energy mainly consisting of light rays in the 400 nm to 700 nm visible light region; 0.02 to 0.5 parts by weight of at least one dye selected from the group consisting of Victoria Pure Blue, anthraquinone dyes, monoazo dyes, and merocyanine dyes, these dyes having maximum absorption wavelengths from 550 to 700 nm; 0.1 to 5 parts by weight of the leuco dye 4,4'-(phenylmethylene bis[N,N-diethylbenzene amine]; and 0.1 to 5 parts by weight of tribromomethylphenyl sulphone.