To provide a paste material, a hardened matter of the same and a manufacturing method therefor, without passing through high temperature firing process, with reduced energy consumption of fossil fuel, etc., and capable of lessening the burden on the environment.

This paste material is obtained by adding an acid solution to a shell incinerated ash or a powdery or particulate Ca-containing compound and by kneading. The paste material is capable of temporarily stopping the hardening reaction by storing under vacuum condition. The hardened matter is obtained by hardening such paste material.