To provide an inter-vehicle damper device that has suppressed influence to vehicle body bending vibration in a vertical direction as much as possible, while reducing roll vibration of the vehicle body.

The inter-vehicle damper device that is installed at a connection part of a first rolling stock 10 and a second rolling stock 20, and has a damper 30 that generates damping force according to the relative roll speed of the vehicle bodies of the first and the second rolling stocks is configured to include: a damper characteristic changing means to change the damping force characteristics of the damper; a roll vibration determination means to determine roll vibration of the vehicle body; a damper control means 50 to increase the damping force of the damper to the damper characteristic changing means when the roll vibration determination means determines the roll vibration.