To heighten the heat storage efficiency by increasing the heat storage amount in a sensible heat storage type floor heating method using only a concrete layer.

A concrete member in which a microcapsule including heat storage material having a melting point of 30 to 80° is kneaded in cement is used as the heat storage material for floor heating. The dry weight proportion of the microcapsule including the heat storage material occupying the concrete member is preferably 10 to 60%, and 50% heat weight decrease temperature of the microcapsule is preferably 150° or higher.