Provided is a hardened cement-based material that is light and strong. A pulverized product forming step of forming a pulverized product 11 by pulverizing a synthetic resin material to a predetermined size, and an oil component remover 18 for removing the oil component 19 of the pulverized product 11 to form an aggregate pulverized product 12. It has an oil component removing step, and a first cement-based hardened body manufacturing step in which the fine aggregate 14 containing the aggregate pulverized material 12, the cement 16 and the water 22 are mixed and hardened. Cement-based hardened body manufacturing method.
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