Wire guide housing for wire electrical discharge machining device

A wire guide housing, for receiving a wire guide for supporting a running wire electrode running substantially in a vertical direction and a conductor that is in contact with the running wire electrode, and formed with a wire running passage through which the running wire electrode passes, comprising:

• a cleaning liquid supply opening, for guiding a cleaning liquid into the wire guide housing;
• a cleaning liquid discharge opening, for discharging the cleaning liquid out of the wire guide housing;
• a first flow passage, for connecting the cleaning liquid supply opening to the wire running passage;
• and
• a second flow passage, for connecting horizontally the wire running passage to the cleaning liquid discharge opening, wherein
• the cleaning liquid flows into the wire running passage only at a side more upstream than the wire guide, and the cleaning liquid flows out of the wire running passage between the conductor and the wire guide.