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.