An optical device (10) for a motorcycle headlamp, the optical device (10) comprising:



a primary optics (100) having a base body (110) and a plurality of light guiding elements (120) for forming a light distribution in a main direction (X), wherein each light guiding element (120) has a common light output surface (130) having an optically relevant area (131),
a holder (300),
a cover element (400), which is attachable to the holder (300), wherein the cover element (400) in combination with the holder (300) is configured to fix the position of the primary optics (100) between the holder (300) and the cover element (400), when the cover element (400) is attached to the holder (300), wherein the primary optics (100) comprises a stabilizing structure (200), wherein the stabilizing structure (200) is built as a protrusion projecting from the common light output surface (130) in the main direction (X), wherein the stabilizing structure (200) having a first support surface (210), and wherein the cover element (400) comprises a first counter-support surface (410), wherein the base body (110) of the primary optics (100) comprises a second support surface (140), and wherein the holder (300) comprises a second counter-support surface, wherein the first counter-support surface (410) in combination with the first support surface (210) of the stabilizing structure (200) is configured to stabilize the position of the curved surface of the optically relevant area (131) of the common light output surface (130) of the primary optics (100) when the cover element (400) is attached to the holder (300).