To provide a roller-compactor capable of suppressing vibration transmitted from a roller to a vehicle body even if the width of the roller cantilever-supported to the vehicle body is long, and to provide a compacting method using the roller-compactor.

The roller-compactor 1 includes the vehicle body 2 allowing a person to ride therein, and a front roller 3 and a rear roller 4 provided at the front and rear parts of the vehicle body 2 respectively. The front roller 3 is provided such that one end 3a is rotatably cantilever-supported by a roller support device 7 extended from the side face of the vehicle body 2 and that the other end 3b opposite to the one end 3a is projected to the side from the vehicle body 2 or to be flush with the side face of the vehicle body 2. A vibration absorbing means 22 for absorbing vertical vibration of the front roller 3 is provided between the front lower face 2a of the vehicle body 2 and the front roller 3.