Abstract: A screed device in a road-paving vehicle such as an asphalt finisher, enabling the width of pavement to be steplessly changed up to about three times the width of the main screed through a simple operation. The screed device is so constituted that a pair of extensible screeds 15, 16 having a width nearly equal to the width of a main screed 7 are arranged back and forth in the direction of progress of the main screed, wherein supports 27, 28 are allowed to move in the direction of width of pavement being supported by support portions 23, 24 provided on both sides at the rear upper portions of the main screed 7, said extensible screeds 15, 16 are supported by said supports 27, 28 so as to be freely moved in the direction of width of pavement, and the extensible screeds 15, 16 are moved by the feeding devices such as hydraulic cylinders in the directions of width of pavement but opposite to each other from the rear positions of the main screed 7.