The invention relates to a holding device (13) for holding a drive unit (7) of a deflecting mirror arrangement (6) of an optical detection device (4) for a motor vehicle (1), wherein the holding device (13) has a holding part (14) with which a light barrier (15) is formed in one piece, wherein the light bulkhead (15) during proper holding of the drive unit (7) by the holding device (13) for temporarily subdividing a reflective surface (11) at least one, on a rotational axis (9) rotatably mounted deflecting mirror (8 ) of the Umlenkspiegelanordnung (6) in a transmitting area (16) and a receiving area (17) in regions on the reflective surface (11) is arranged. The invention also relates to an optical detection device (4) and a motor vehicle (1).
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