High-strength thick steel plate for construction having excellent characteristics for preventing diffusion of brittle cracks, and production method therefor

Provided are: a high-strength thick steel plate for construction having excellent characteristics for preventing the diffusion of brittle cracks, said plate being used for ships and having a preferred plate thickness of at least 50 mm; and a method for producing the thick steel plate. The thick steel plate has excellent characteristics for preventing the diffusion of brittle cracks, characterized in that: the thick steel sheet has a specific component composition; the main constituent of the metal structure is a ferrite phase; the thick metal sheet has an aggregate structure in which the density (I) in the RD//(110) plane at the plate thickness surface is at least 1.3, and the density (I) in the RD//(110) plane at the plate thickness center is at least 1.8; the Charpy fracture appearance transition temperature (vTrs) at the surface is not more than -60 DEG C, and the Charpy fracture appearance transition temperature (vTrs) at the plate thickness center is not more than -50 DEG C.