PROBLEM TO BE SOLVED: To achieve stable driving over a long period by suppressing the generation of slime in concentration chambers.SOLUTION: Provided is an electric type deionized water production device 10 comprising: a desalinization chamber D located between an anode and a cathode, partitioned with an anion exchange membrane on the anode side and a cation exchange membrane on the cathode side and filled with at least either a cation exchanger or an anion exchanger； and a pair of concentration chambers C1, C2 arranged at both sides of the desalinization chamber via an anion exchange membrane and a cation exchange membrane, and including a fungicide injection means 3 injecting an oxidizing fungicide to concentration water fed to the concentration chambers C1, C2.SELECTED DRAWING: Figure 2【課題】濃縮室内にスライムが発生することを抑制することで、長期にわたり安定した運転を可能にする。【解決手段】電気式脱イオン水製造装置１０は、陽極と陰極との間に位置し、陽極側のアニオン交換膜と陰極側のカチオン交換膜とで区画され、カチオン交換体とアニオン交換体との少なくとも一方が充填された脱塩室Ｄと、アニオン交換膜およびカチオン交換膜を介して脱塩室の両側に配置された一対の濃縮室Ｃ１，Ｃ２とを備え、濃縮室Ｃ１，Ｃ２に供給される濃縮水に酸化性殺菌剤を注入する殺菌剤注入手段３を有している。【選択図】図２
