To provide a hydrogen generating apparatus capable of generating hydrogen gas of not less than 0.1 L and not more than 100 L per 1 g of a hydrogen-supporting powder by contact with moisture, and hydrogen A method for producing a supported powder is provided. SOLUTION: The method for producing a hydrogen-supported powder according to the present invention is a method for producing a hydrogen-supported powder, wherein a gas atmosphere having a temperature of more than 450 C. and 900 C. or less, a hydrogen concentration of 5 vol% or more and 100 vol% or less and a pressure of 0.1 MPa or more and 1.5 MPa or less A heat treatment step of heat treating the calcium carbonate-containing powder to prepare a hydrogen-supporting powder precursor, a high temperature treatment step of heating the calcium carbonate-containing powder at a temperature of from 150 C. to 400 C., a hydrogen concentration of from 5 vol% to 100 vol% A low temperature treatment step of heat-treating the hydrogen-supporting powder precursor in a gas atmosphere having a pressure of 1.5 MPa or less to produce a hydrogen-supporting powder. (FIG.【課題】本発明は、水分と接触することにより、水素担持粉末1g当たり0.1μL以上100μL以下の水素ガスを発生し、且つ、その水分の酸化還元電位が-400mV以上-30mV以下となる水素担持粉末の製造方法を提供する。【解決手段】本発明に係る水素担持粉末の製造方法は、温度が450℃超900℃以下、水素濃度が5vol%以上100vol%以下、且つ圧力が0.1MPa以上1.5MPa以下であるガス雰囲気下において、炭酸カルシウム含有粉末を熱処理して水素担持粉末前駆体を製造する高温処理工程、及び 温度が150℃以上400℃以下、水素濃度が5vol%以上100vol%以下、且つ圧力が0.1MPa以上1.5MPa以下であるガス雰囲気下において、水素担持粉末前駆体を熱処理して水素担持粉末を製造する低温処理工程、を含むことを特徴とする。【選択図】図2
