A sterile water producing apparatus that even when the operation interval of electromagnetic pump is long, is capable of causing the pH value and effective free hypochlorous acid concentration of produced sterile water to be constant at all times. First passage (16) for mixing of raw water with sodium hypochlorite is communicated with communication passage (50), and an opening of first introduction pipe (32) for discharging of sodium hypochlorite from first electromagnetic pump (26) is disposed inside the communication passage (50). Eddy (60) containing sodium hypochlorite is generated by thesodium hypochlorite discharged from the opening of first introduction pipe (32) and by the raw water flowing in the communication passage (50) from the first passage (16), and part of the eddy (60) is caused to protrude in the first passage (16). As a result, the sodium hypochlorite discharged from the first introduction pipe (32) rides the eddy (60) and within given period of time, is mixed withthe raw water flowing through the first passage (16).