The present invention provides a watch equipped with a device for illuminating the display space, which is relatively easy to manufacture and fit into the watch by passing it through the inner surface of the
flange. [Solution] The watch (2) comprises a
flange (14), an inner surface (28) defining a display space (70) on its side, and an illumination device (20) having at least one
light source (10) powered by a power source on the watch. The illumination device more specifically comprises at least one translucent element (12) forming a
flange arranged above the at least one
light source, a lower injection surface (22) configured to allow most of the light (30) provided by the at least one
light source to be injected into at least the translucent element, a lateral
exit surface (26) from which at least the majority of the light injected into at least the translucent element can exit, and an intermediate surface (24) configured to receive at least the majority of the injected light without any prior reflection and substantially reflect at least the majority of the injected light toward the lateral
exit surface.