TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The metallic element (E) contains element selected from lithium, sodium, potassium, magnesium and calcium. The amide compound contains lithium and magnesium, such that the composition ratio (p1:p2) of lithium and magnesium is more than 0.7. The metal hydride contains lithium and magnesium, such that the composition ratio (p3:p4) of lithium and magnesium is 1, and satisfies p2less than or equal top4-0.7 and p2greater than or equal top4+0.7. The inorganic material contains element selected from titanium, silicon, aluminum and carbon. The inorganic material contains a carbon type material, and stores hydrogen. The carbon type material contains graphite, amorphous carbon, fibrous carbon and activated carbon. The hydrogen storage material contains 5-20 wt.% of carbon type material. Preferred Properties: The metal hydride has particle diameter of 0.01-20 microns. The carbon type material has Brunauer Emmett Teller (BET) specific surface area of more than 3- m2/g. The carbon type material has ratio (Id/Ig) of spectral intensity (Id) of D-band and spectral intensity (Ig) of G-band of 0.7 or more, by laser Raman spectrometry.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The material (M) is amide compound or imide compound which has element (A) contained in metallic element (E) or metal hydride which has element (B) contained in metallic element (E). The amide compound is A(NH2)x' and metal hydride is BHy', and satisfy relations: A(NH2)x and x/yBHy reacted to form ABx/y(NH)x and xH2, A(NH2)x and 4x/3yBHy are reacted to form ANx/3, 4x/3yB(NH)y/2 and 4/3xH2, and A(NH2)x and 2x/yBHy are reacted to form ANx/3, 2x/yBNy/3 and 2xH2, where A is not similar to B and x and y are not defined, and A(NH2)x and AHx are reacted to form 2A(NH)x/2 and xH2, A(NH2)x and 4/3AHx are reacted to form ANx/3, 4/3A(NH)x/2 and 4/3xH2 and A(NH2)x and 2AHx are reacted to form 3ANx/3 and 2xH2, where A is similar to B and x and y are not defined.