To provide a new mixed cement (hardened material) capable of securing the strength required when incineration ash or a silica supplying object is used as the raw material, and to provide a hardened body made of the mixed cement.

The mixed cement is made of a mixture composed of a 20-95 wt.% silica supplying object comprising at least one selected from milt, silica stone, diatomaceous earth, earthenware pieces obtained by crushing earthenware, refuse-melted slag and blast furnace slag; lime of 1-20 wt.%; coal ash of 1-20 wt.%; plaster of 1-45 wt.%; and portland cement of 1-50 wt.%, and in which ≥90 wt.% of the whole of the mixture has the maximum grain size of ≤200 μm.

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