TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Material: Nano structuring of hydrogenated carbonaceous material is carried out by predetermined mechanical grinding processing, in hydrogen gas atmosphere. The metal hydride is miniaturized by the processing. The material further has catalyst functional substance that promotes hydrogen desorption reaction by the hydrogenated carbonaceous material and metal hydride. The catalyst functional substance is selected from boron, carbon, manganese, iron, cobalt, nickel, platinum, palladium, rhodium, lithium, sodium, magnesium, potassium, iridium, neodymium, lanthanum, calcium, vanadium, titanium, chromium, copper, zinc, aluminum, silicon, ruthenium, molybdenum, tungsten, tantalum, zirconium, hafnium, silver, its compound or their alloy. The load of catalyst functional substance is 0.1-20 mass% of metal hydride. The main component of metal hydride is lithium hydride. The carbonaceous material is a mixture of graphite activated carbon, amorphous carbon and carbon nano tube. The ratio of carbon atom number in hydrogenated carbonaceous material, and metal atom number in metal hydride, is 1:3-3:1.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Material: Nano structuring of hydrogenated carbonaceous material is carried out by predetermined mechanical grinding processing, in hydrogen gas atmosphere. The metal hydride is miniaturized by the processing. The material further has catalyst functional substance that promotes hydrogen desorption reaction by the hydrogenated carbonaceous material and metal hydride. The catalyst functional substance is selected from boron, carbon, manganese, iron, cobalt, nickel, platinum, palladium, rhodium, lithium, sodium, magnesium, potassium, iridium, neodymium, lanthanum, calcium, vanadium, titanium, chromium, copper, zinc, aluminum, silicon, ruthenium, molybdenum, tungsten, tantalum, zirconium, hafnium, silver, its compound or their alloy. The load of catalyst functional substance is 0.1-20 mass% of metal hydride. The main component of metal hydride is lithium hydride. The carbonaceous material is a mixture of graphite activated carbon, amorphous carbon and carbon nano tube. The ratio of carbon atom number in hydrogenated carbonaceous material, and metal atom number in metal hydride, is 1:3-3:1. EXAMPLE - Graphite and lithium hydride of 95% purity, were mixed such that the ratio of carbon atom and lithium atom was 1:1. The mixture was provided in a mill container. The mill container was evacuated and high purity hydrogen gas was introduced such that the mill container internal pressure was 1 MPa. An epicyclic type ball mill apparatus was used and milling processing was carried out at 250 rpm for 32 hours. A hydrogen storage material was obtained.