Rain sensor

Rain sensor, especially for an automobile, including at least one radiation sender (16) and at least one radiation receiver (18) which gives a signal, depending on the received radiation, and at least one light guide body (20), which, with a base surface (24) can be connected to a plate (12) via a coupling medium (26). Radiation from the sender is guided in the direction of the plate, and coupling medium (26) has at least one light guide structure (30).