Abstract: A low pressure discharge lamp of double tube structure comprises an outer bulb containing therein a sealed gas and having one end closed and an inner tube supported by an end plate to communicate with the interior of the outer bulb; receiving therein an electrode and restricting an electric discharging path. The end receiving therein the electrode of the inner tube is bonded with an adhesive on the surface on the side facing the outer bulb of the end plate and a part of an end other than said end of said inner tube is in contact to and supported by the end plate. The construction makes bonding operations of the inner tube to the end plate easy and provide a stable condition to the inner tube in an lamp assemblage and reduces lamp weight.