The central and lateral mowing units have mower structure (20) with mowing knives (48) arranged at bottom. A guiding element (60) is arranged on lateral mowing unit under the mower structure. The guiding element is extended downwardly from the mower structure to guide material cut by mowing knife. A recess (70) is formed in guiding element, and is provided with recess portion (72) located between central mowing unit and a plane extended in mowing direction (MR) and in direction of rotation axis, and a recess section (74) located between same plane and a side of mowing device.
