Silicon fine nanoparticles obtained by pulverizing silicon fine particles in ethanol and / or those in which a part thereof is aggregated are brought into contact with hydrogen peroxide (H 2 O 2) water, and then brought into contact with water or an aqueous solution. Thus, hydrogen is generated to obtain a hydrogen-containing liquid or hydrogen water having a predetermined controlled hydrogen concentration in the water or the aqueous solution. In the production of this hydrogen-containing liquid or hydrogen water, it is possible to safely and efficiently produce hydrogen water containing dissolved hydrogen in a concentration and amount that can withstand practical use, starting from silicon fine particles. Therefore, it will be an effective use of silicon fine particles, contributing to environmental protection, as well as improving the biosafety of hydrogen generating materials and hydrogen water, which are particularly effective in the health and medical fields, and greatly reducing manufacturing costs. .シリコン微細粒子をエタノール中で粉砕して得られるシリコン微細ナノ粒子及び／又はその一部が凝集体となったものを、過酸化水素（Ｈ２Ｏ２）水に接触させた後、水又は水溶液に接触させることにより水素を発生させて、該水又は該水溶液中に所定の制御された水素濃度を有する水素含有液又は水素水を得る。この水素含有液又は水素水の製造には、シリコン微細粒子を出発材料として、実用に耐え得る濃度と量の溶存水素を含む水素水を、安全に効率よく製造することが可能である。従って、シリコン微細粒子の有効活用にもなり、環境保護に貢献するとともに、特に健康・医療分野での有効な水素発生材及び水素水の生体安全性の向上や製造コストの大幅削減にも寄与する。
