Electric discharge lamp apparatus with insulating plug

An electric discharge lamp apparatus comprising:

• an arc tube;
• an insulating plug made of synthetic resin, the insulating plug supporting the arc tube;
• a metal lead support serving as a passage for electric power to be supplied to the arc tube, wherein the metal lead support has a bent portion;
• an insulating sleeve made of a ceramic wherein the insulating sleeve has a hollow pipe shape and an inner surface into which the lead support is inserted, wherein a predetermined gap is provided between the inner surface of the insulating sleeve and an outer surface of the lead support, and the bent portion of the metal lead support comes into contact with the inner surface of the insulating sleeve,
• wherein the insulating plug has a sleeve insertion hole which is opened in the front surface of the insulating plug and through which the rear end of the insulating sleeve is inserted so as to be accommodated, and a predetermined gap is provided between the inner surface of the sleeve insertion hole and the outer surface of the insulating sleeve, and
• wherein the insulating plug has a lead-support insertion hole, and a tapered hole communicating between the sleeve insertion hole and the lead-support insertion hole.