An energy-saving ionized water production device and a production method are provided that are capable of producing strongly alkaline ionized in a short period of time.An ionized water production device 1 is used that is configured such that a first electrolysis cell 20A is arranged in a first electrolysis bath 10A, a second electrolysis cell 20B is arranged in a second electrolysis bath 10B, and alkaline ionized water formed in an electrolysis diaphragm 21 of the first electrolysis cell 20A is quantitatively and continuously transferred to an electrolysis diaphragm of the second electrolysis cell 20B by a transfer pump 50 arranged in a water filling pipe 27A of the first electrolysis cell 20A, and current is applied by setting the current applied to the first electrolysis cell 20A to 5 amperes to 15 amperes and setting the current applied to the second electrolysis cell 20B to 15 amperes to 20 amperes within a range of a total current applied to the first electrolysis cell 20A and the second electrolysis cell 20B of 25 amperes to 30 amperes.