An object detection device, comprising: a controller ; a first sensor that receives a first control signal from the controller and transmits a first ultrasonic energy wave to a first region ; and a second sensor that receives a second control signal from the controller and transmits a second ultrasonic energy wave to a second region partially overlapping with the first region , wherein the first sensor is configured to receive a first reflected wave of the first ultrasonic energy wave, convert the first reflected wave into a first self-signal, and transmit the first self-signal to the controller , and to receive a second reflected wave of the second ultrasonic energy wave, convert the second reflected wave into a first correspondence signal, and transmit the first correspondence signal to the controller , the second sensor is configured to receive the second reflected wave of the second ultrasonic energy wave, convert the second reflected wave into a second self-signal, and transmit the second self-signal to the controller , and to receive the first reflected wave of the first ultrasonic energy wave, convert the first reflected wave into a second correspondence signal, and transmit the second correspondence signal to the controller , the controller is configured to detect an object based on the first self-signal, the first correspondence signal, the second self-signal, and the second correspondence signal, and when the second correspondence signal is equal to or above a threshold, and the first self-signal is below the threshold, the controller determines that a foreign substance is adhered on the first sensor . a controller ; a first sensor that receives a first control signal from the controller and transmits a first ultrasonic energy wave to a first region ; and a second sensor that receives a second control signal from the controller and transmits a second ultrasonic energy wave to a second region partially overlapping with the first region , wherein the first sensor is configured to receive a first reflected wave of the first ultrasonic energy wave, convert the first reflected wave into a first self-signal, and transmit the first self-signal to the controller , and to receive a second reflected wave of the second ultrasonic energy wave, convert the second reflected wave into a first correspondence signal, and transmit the first correspondence signal to the controller , the second sensor is configured to receive the second reflected wave of the second ultrasonic energy wave, convert the second reflected wave into a second self-signal, and transmit the second self-signal to the controller , and to receive the first reflected wave of the first ultrasonic energy wave, convert the first reflected wave into a second correspondence signal, and transmit the second correspondence signal to the controller , the controller is configured to detect an object based on the first self-signal, the first correspondence signal, the second self-signal, and the second correspondence signal, and when the second correspondence signal is equal to or above a threshold, and the first self-signal is below the threshold, the controller determines that a foreign substance is adhered on the first sensor . <EOS>