Mineral water which contains mineral ingredients released from a soft porous ancient marine humic substance and including a calcium ingredient, the calcium ingredient accounting for at least 90% of the mineral ingredients. The mineral water contains SiO<；SUB>；2<；/SUB>；, Al, Fe, Ca, Mg, K, Ti, P, Na, and Mn which are mineral ingredients released from a soft porous ancient marine humic substance and in which the calcium ingredient accounts for 90 wt.% or more of the total amount of the mineral ingredients. Also provided is a process for mineral water production which comprises passing raw water through superposed layers of a soft porous ancient marine humic substance ceramic obtained by adhering a powder of a soft porous ancient marine humic substance in a layer arrangement to a particulate ore of a soft porous ancient marine humic substance and burning them and through superposed layers comprising a burned powder of a soft porous ancient marine humic substance to dissolve mineral ingredients, i.e., SiO<；SUB>；2<；/SUB>；, Al, Fe, Ca, Mg, K, Ti, P, Na, Mn, Co, Ba, Zn, Sn, V, Ni, and Cu, in the raw water. Thus, mineral water containing the calcium ingredient in an amount of 90 wt.% or larger based on the total amount of the mineral ingredients is produced.
