A vibration-imparting device comprising: a vibrator device having at least a roller rotatable around a rotary shaft at a position offset with respect to the rotary shaft, and an elastic tube device for imparting vibration to a liquid within a balloon in a balloon catheter, said device comprising an elastic tube which is configured to be used with a heating liquid filled within a portion thereof and which is expanded or constricted in such a manner that tube walls of said elastic tube opposite to each other are caused to be closely attached to each other in a radial direction upon application of an external force toward a direction in which the elastic tube is closed and that they are allowed to recover to its original size due to its own elasticity when the external force is released; wherein said elastic tube has the top end closed and the base end portion constituting a connection part to a catheter main body; wherein said elastic tube has a margin volume part disposed on the top end side so as not to be pressed by the external force; characterized in that the elastic tube is provided with the vibrator device in such a way that a predetermined direction of rotation of the rotary shaft is set to be directed from the side of the base end portion of the elastic tube towards the side of the top end portion thereof, and that a plurality of indicators (S1, S2, S3) are disposed on an outer peripheral surface of said elastic tube at a spaced interval in a longitudinal direction of the elastic tube, said indicators (S1, S2, S3,) configured to indicate sizes of said margin volume part which are to be set in accordance with the size of the balloon. a vibrator device having at least a roller rotatable around a rotary shaft at a position offset with respect to the rotary shaft, and an elastic tube device for imparting vibration to a liquid within a balloon in a balloon catheter, said device comprising an elastic tube which is configured to be used with a heating liquid filled within a portion thereof and which is expanded or constricted in such a manner that tube walls of said elastic tube opposite to each other are caused to be closely attached to each other in a radial direction upon application of an external force toward a direction in which the elastic tube is closed and that they are allowed to recover to its original size due to its own elasticity when the external force is released; wherein said elastic tube has the top end closed and the base end portion constituting a connection part to a catheter main body; wherein said elastic tube has a margin volume part disposed on the top end side so as not to be pressed by the external force; characterized in that the elastic tube is provided with the vibrator device in such a way that a predetermined direction of rotation of the rotary shaft is set to be directed from the side of the base end portion of the elastic tube towards the side of the top end portion thereof, and that a plurality of indicators (S1, S2, S3) are disposed on an outer peripheral surface of said elastic tube at a spaced interval in a longitudinal direction of the elastic tube, said indicators (S1, S2, S3,) configured to indicate sizes of said margin volume part which are to be set in accordance with the size of the balloon.