CHEMICAL HEAT STORAGE REACTOR AND CHEMICAL HEAT STORAGE SYSTEM

A flow path for supplying water vapor to a heat storage material is secured and a fall in reactivity of the heat storage material is suppressed. A reactor 20 includes: heating medium flow paths 24, 25; a reaction vessel 22 configuring a water vapor flow path interposed between the heating medium flow paths; a main tube section 26 provided centrally inside the reaction vessel 22; branch tube sections 28A, 28B provided inside the reaction vessel outside the main tube section 26 on both sides; and heat storage materials 30A, 30B provided inside the reaction vessel at the two outsides of the branch tube sections. When the heat storage materials expand due to a hydration reaction a water vapor flow path can be secured. Supplying too much water vapor to the heat storage materials and a fall in reactivity of the heat storage materials can accordingly be suppressed.