To produce an artificial stone material composed of the hydrated solidified body of a slag raw material with high productivity.

In the method where the kneaded material A of a raw material essentially consisting of steel slag and blast furnace slag fine powder and water is placed to a yard, and is subjected to hydration hardening, and the hydrated solidified body is roughly crushed, so as to produce an artificial stone material, the yard is provided with parallel troughs of a plurality of strips, and the kneaded material A is placed to the grooves between the troughs. Since a long and slender hydrated solidified body is formed between the troughs, in the rough crushing stage, each lumpy stone material can be obtained only by subjecting the hydrated solidified body to two face crushing in the width direction, and the rough crushing operation can be extremely efficiently performed, thus the artificial stone material composed of the hydrated solidified body of the slag raw material can be produced with high productivity.

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