To enable lighting quickly a white fluorescent lamp illuminating the inside of a cold storage chamber when a door is opened.

A fluorescent lamp accommodating space 34 separated from the internal space of a cold storage chamber 12 by a case body 26 and a shade 28 is formed at the front part of the ceiling wall 30 of the cold storage chamber 12, a case thermal conductor 46 is arranged to the outer side surface of the case body 26, an antisweat pipe 42 arranged to the front part of the ceiling wall 30 is contacted to the flange part 38 of an outer box 20, the flange part 38 is connected with the case thermal conductor 46, and the heat from the antisweat pipe 42 is transferred to the fluorescent lamp accommodating space 34 inside the case body 26 through the flange part 38 and the case thermally conducting body 46.