A lightening device for small objects includes a low voltage light source (1), which is placed inside an object (31,32). The object (31,32) can be opened, so as to allow the access to its inside, and then closed. The device includes also a battery (3) for supplying power to the light source (1), which is placed inside the object (31,32). Moreover, the device includes a switch (4) for the power supply battery (3), situated between the light source (1) and the battery (3), and operated to turn on and off the light source (1).