An object of this invention is to change room temperature or cooling drinking water to hydrogen rich water that contains hydrogen abundantly simply and efficiently without using an electrolytic device, and a hydrogen rich water generator 2 is provided by filling magnesium grain 4 that generates hydrogen gases by reacting with the drinking water 6 and silver grain 3 into the case 1 made of ceramics of water permeability and porosity. This hydrogen rich water generator 2 together with the drinking water 6 are filled in the vessel 5, and the drinking water 6, magnesium grain 4 and the ceramics and the silver grain 3 are caused to react in the vessel 5 to generate the hydrogen gases, and the drinking water 6 in the vessel 5 is purified by the reaction of the silver grain 3 and is changed to the hydrogen rich water having hydrogen abundantly and anti-bacterial action.