To solve a problem that it is difficult to bond a base and a lead well in a cold-cathode fluorescent discharge lamp.

The base 11 in order to attach it to a glass tube 4 has the metal base body 12 having an inner diameter into which the glass tube 4 can be inserted, a lead connection part 13, and a coupling part 14. The lead connection part 13 and the lead 6 are bonded by using a connection auxiliary member 19. The connection auxiliary member 19 has a part abutting on the lead 6, and a part abutting on the lead connection part 13. By this, strong bonding of the lead connection part 13 and the lead becomes possible.