A windrow merger for collecting agricultural products from a field in an advancing direction, comprising: - a frame, having a crosspiece oriented transversal to the advancing direction, and a first and a second upright (202A,202B) fixed to the crosspiece to project upwards; - a pick up device for picking up the agricultural products; - a conveyor, connected to the frame and configured to receive the agricultural products from the pick up device and moving them in a conveying direction, oriented horizontally and transversal to the advancing direction; - a guiding device, placed upstream of the pick-up device with respect to the advancing direction and configured for guiding the agricultural products towards the conveyor, wherein the guiding device is movable between a lowered position, proximal to the pick-up device, and a raised position, distal from the pick-up device; - a support structure, for movably supporting the guiding device, the support structure including a first arm and a second arm, each having a first end (601A,602A) connected to the guiding device and a second end (601B,602B) articulated to the frame, so that the support structure is pivotable with respect to the frame around a pivoting axis parallel to the conveying direction; - an actuating structure, characterized in that the actuating structure includes a rod extending parallel to the conveying direction between a first end a second end and rotatably connected to the first and second uprights (202A,202B), at the first and second end (701A,702A), respectively, to rotate along a rotation axis, the rotation axis being parallel to the pivoting axis, a first bar and a second of bar connected to the first arm and the second arm, respectively, each of said first and second bar (702,703) being connected to the respective arm (601,602) at a driving point, located between the first and the second end of the arm (601A,602A,601B,602B), and being connected to the rod, so that a rotation of the rod around the rotation axis is kinematically linked to a rotation of the support structure around the pivoting axis, through the first and the second bar (702,703); an actuator, connected to the frame and to the rod so that a position of the actuator is kinematically linked to the angular position of the rod around the rotation axis. - a frame, having a crosspiece oriented transversal to the advancing direction, and a first and a second upright (202A,202B) fixed to the crosspiece to project upwards; - a pick up device for picking up the agricultural products; - a conveyor, connected to the frame and configured to receive the agricultural products from the pick up device and moving them in a conveying direction, oriented horizontally and transversal to the advancing direction; - a guiding device, placed upstream of the pick-up device with respect to the advancing direction and configured for guiding the agricultural products towards the conveyor, wherein the guiding device is movable between a lowered position, proximal to the pick-up device, and a raised position, distal from the pick-up device; - a support structure, for movably supporting the guiding device, the support structure including a first arm and a second arm, each having a first end (601A,602A) connected to the guiding device and a second end (601B,602B) articulated to the frame, so that the support structure is pivotable with respect to the frame around a pivoting axis parallel to the conveying direction; - an actuating structure, characterized in that the actuating structure includes a rod extending parallel to the conveying direction between a first end a second end and rotatably connected to the first and second uprights (202A,202B), at the first and second end (701A,702A), respectively, to rotate along a rotation axis, the rotation axis being parallel to the pivoting axis, a first bar and a second of bar connected to the first arm and the second arm, respectively, each of said first and second bar (702,703) being connected to the respective arm (601,602) at a driving point, located between the first and the second end of the arm (601A,602A,601B,602B), and being connected to the rod, so that a rotation of the rod around the rotation axis is kinematically linked to a rotation of the support structure around the pivoting axis, through the first and the second bar (702,703); an actuator, connected to the frame and to the rod so that a position of the actuator is kinematically linked to the angular position of the rod around the rotation axis. a rod extending parallel to the conveying direction between a first end a second end and rotatably connected to the first and second uprights (202A,202B), at the first and second end (701A,702A), respectively, to rotate along a rotation axis, the rotation axis being parallel to the pivoting axis, a first bar and a second of bar connected to the first arm and the second arm, respectively, each of said first and second bar (702,703) being connected to the respective arm (601,602) at a driving point, located between the first and the second end of the arm (601A,602A,601B,602B), and being connected to the rod, so that a rotation of the rod around the rotation axis is kinematically linked to a rotation of the support structure around the pivoting axis, through the first and the second bar (702,703); an actuator, connected to the frame and to the rod so that a position of the actuator is kinematically linked to the angular position of the rod around the rotation axis.