A discharge tube of the present invention includes a glass bulb in which noble gas is enclosed, a pair of electrodes protruding from both ends of the glass bulb in the longitudinal direction of the glass bulb, and a connector connected to each of the electrodes. Each of the electrodes includes at least an axis section and a large-diameter section with a step section and a circumferential face. The step section has a first latching section for latching onto the connector. The circumferential face has a contact section with which the connector comes in contact. The connector includes a connector body into which the electrode is inserted, a second latching section for latching onto the first latching section of the electrode, and a connecting section connected to the contact section of the electrode. This achieves a discharge tube with high connection reliability and high heat radiation efficiency, and a light-emitting apparatus provided with this discharge tube.