Device for fixing an electric bulb comprising a base and an optical diffuser to a socket installed on a ceiling Device (1) for fixing an electric bulb (5) comprising a socket (52) and an optical diffuser (50) to a socket (6 ) installed on a ceiling, the device (1) comprising a cylindrical pole (2) defining an axial direction (DA) and a radial direction (DR) and extending between a first and a second axial ends (21, 22), and a retaining end piece (4) extending in the axial direction (DA) between a first axial end (41) fixed to the pole (2) and a second axial end (42). The second end (42) of the end piece (4) comprises, over at least part of its length in the axial direction (DA), a frustoconical wall (425) of elastically deformable material defining an internal housing (420) shaped frustoconical. for receiving the optical diffuser (50) of an electric bulb (5), the optical diffuser (50) being disposed between the base (52) of an electric bulb (5) and said end cap (4) when an electric bulb (5) is placed in the end piece (4), and held by the elastically deformable frustoconical wall. Figure for the abstract: Fig. 1.
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