To provide a low-temperature showcase eliminating degradation in cooling efficiency caused by lighting in a display chamber, achieving the lighting within a small space, and appropriately securing the thickness dimension of a heat insulating wall.

The low-temperature showcase R for displaying merchandise while cooling it in the display chamber 6 constituted in a heat insulating box body 2 includes: a light guide member 33 provided from outside the heat insulating box body 2 and to inside the display chamber 6; and lighting sources 30 and 31 provided outside the heat insulating box body 2. The light guide member 33 has a light incident part 42 and a light emitting surface 36 emitting the light incident from the light incident part 42. The light emitting surface 36 is located in the display chamber 6, and the light incident part 42 is located outside the heat insulating box body 2 and faces the light sources 30 and 31.