The invention relates to a device for the error monitoring of chassis components of rail vehicles, including at least one vibration sensor. According to one embodiment of the invention, at least one vibration sensor is arranged on a bogie frame or on a wheel set bearing of an axis of a bogie of the rail vehicle such that the detection direction thereof has a component in the moving direction (x-direction) or a component perpendicular to the moving direction (y-direction) and at the same time a component parallel to the vertical axis (z-direction) of the rail vehicle.