The invention relates to a device (1) for mounting a seat (2) or a standing plate (25) relative to a frame (3) of a vehicle. The device comprises a seat holder (4) or a standing plate holder (4a) having at least one flange (7) extending laterally from the seat holder or the standing plate holder. The seat holder or the standing plate holder is pivotally mounted to the frame so that the frame and the seat holder or the standing plate holder can move relative to each other. The device has at least one first vibration damper (8) and/N or at least one stop (10) limiting the possible movement of the at least one flange thereby providing free movement until limits for the pivotal movement are met; these limits are adjustable. The device may also be provided with other kinds of vibration dampers (15, 18) designed and arranged to counteract that vibrations and movements of the frame during driving are transferred to the driver. Hereby a less damaging and more pleasant driving is obtained. The invention also relates to a vehicle with such a device.