To suppress temperature reduction of a fluorescent lamp tube end part and prevent reduction in the light output, by minimizing thermal conduction from the base part of the fluorescent lamp.

An end cap 7 made of a resin is installed at the tube end of a heat-retaining pipe 2, the end cap 7 is fitted to the tip side of the fluorescent lamp base 6, the fluorescent lamp 3 is housed in the heat-retaining pipe 2 in a state that the base end part and a base pin are protruded outward from the end cap 7 end face, the socket 4 is made of a resin and has a hollow part 4a in the inside, a connection fitting 12 of the base pin 6a is arranged and installed in the hollow part 4a, a pin insertion hole 10a for engaging the base pin 6a with the connection fitting 12 is formed in a face of the end cap 7 side, and a shielding end part cap 9, made of rubber to cover the end part of the heat-retaining pipe 2, is equipped in a state that the fluorescent lamp 3 housed in the heat-retaining pipe 2 is connected.