Disclosed herein are an object detection apparatus for detecting an object and a financial apparatus using the same. In an embodiment, the object detection apparatus may include a light emission unit configured to emit light and a light-reception unit configured to receive both direct light that is emitted by the light emission unit and reflected light of the light emitted by the light emission unit which is reflected by an object to be detected. In accordance with an embodiment of the present invention, the object detection apparatus can perform self-diagnosis, such as autonomously determining whether a failure is present and measuring sensitivity, although an object, that is, the subject of detection, is not present and process media, such as bills. Accordingly, performance in detecting a medium can be improved in financial apparatuses that perform deposit and withdrawal.