An agricultural electrolyzed water generating apparatus comprising: an electrolysis tank containing a first electrode chamber (Da) having a cathode, a second electrode chamber (Db) having an anode, and a separating membrane (Sp) separating the first electrode chamber (Da) and the second electrode chamber (Db) from each other; a first water inlet path connected to the first electrode chamber (Da) to supply the first electrode chamber (Da) with raw water from outside; a second water inlet path connected to the second electrode chamber (Db) to supply the second electrode chamber (Db) with the raw water from outside; a first water outlet path connected to the first electrode chamber (Da), and carrying to outside hydrogen-containing electrolyzed water generated by electrolysis in the first electrode chamber (Da); a second water outlet path connected to the second electrode chamber (Db), and carrying to outside electrolyzed acidic water generated by the electrolysis in the second electrode chamber (Db); and a charge amount adjuster connected to the electrolysis tank for adjusting, during the electrolysis, an amount of electrical charge to be provided to the hydrogen-containing electrolyzed water, wherein the charge amount adjuster adjusts the amount of electrical charge per unit quantity of the generated hydrogen-containing electrolyzed water through control of an electrolytic current or an electrolytic voltage, wherein the amount of electrical charge being calculated by Expression C = I × s where "C" is an amount of electrical charge, "I" is an electrolytic current, and "s" is a time period (in seconds) required for one liter of water to travel through an inside of the electrolyzed water generating apparatus including the electrolysis tank, characterized in that the amount of electrical charge per unit quantity of the generated hydrogen-containing electrolyzed water ranges from 8C/L to 300 C/L, preferably from 37.5 C/L to 180 C/L, more preferably from 42 C/L to 73.5 C/L. an electrolysis tank containing a first electrode chamber (Da) having a cathode, a second electrode chamber (Db) having an anode, and a separating membrane (Sp) separating the first electrode chamber (Da) and the second electrode chamber (Db) from each other; a first water inlet path connected to the first electrode chamber (Da) to supply the first electrode chamber (Da) with raw water from outside; a second water inlet path connected to the second electrode chamber (Db) to supply the second electrode chamber (Db) with the raw water from outside; a first water outlet path connected to the first electrode chamber (Da), and carrying to outside hydrogen-containing electrolyzed water generated by electrolysis in the first electrode chamber (Da); a second water outlet path connected to the second electrode chamber (Db), and carrying to outside electrolyzed acidic water generated by the electrolysis in the second electrode chamber (Db); and a first water inlet path connected to the first electrode chamber (Da) to supply the first electrode chamber (Da) with raw water from outside; a second water inlet path connected to the second electrode chamber (Db) to supply the second electrode chamber (Db) with the raw water from outside; a first water outlet path connected to the first electrode chamber (Da), and carrying to outside hydrogen-containing electrolyzed water generated by electrolysis in the first electrode chamber (Da); a second water outlet path connected to the second electrode chamber (Db), and carrying to outside electrolyzed acidic water generated by the electrolysis in the second electrode chamber (Db); and a charge amount adjuster connected to the electrolysis tank for adjusting, during the electrolysis, an amount of electrical charge to be provided to the hydrogen-containing electrolyzed water, wherein the charge amount adjuster adjusts the amount of electrical charge per unit quantity of the generated hydrogen-containing electrolyzed water through control of an electrolytic current or an electrolytic voltage, wherein the amount of electrical charge being calculated by Expression C = I × s where "C" is an amount of electrical charge, "I" is an electrolytic current, and "s" is a time period (in seconds) required for one liter of water to travel through an inside of the electrolyzed water generating apparatus including the electrolysis tank, characterized in that the amount of electrical charge per unit quantity of the generated hydrogen-containing electrolyzed water ranges from 8C/L to 300 C/L, preferably from 37.5 C/L to 180 C/L, more preferably from 42 C/L to 73.5 C/L.