LEAKAGE OIL DETECTION APPARATUS AND LEAKAGE OIL DETECTION METHOD

An object of the present invention is to provide a leakage oil detection device and a leakage oil detection method capable of accurately detecting leakage oil when a background noise due to daytime sunlight is large. A leakage oil detection device configured to detect leakage oil in an oil filled apparatus includes: a light source configured to irradiate the oil filled apparatus with light; an imaging device configured to capture an image of the oil filled apparatus; a control device configured to control operations of the light source and the imaging device; a storage device configured to store a captured image; an image processing device configured to process the stored image; and a display device configured to display a processing result. The light source and the imaging device are arranged in a manner of being capable of capturing specular reflection light from a surface of the oil filled apparatus as a target object. The image processing device recognizes a brightest portion and a dark portion adjacent to the brightest portion on the captured image as leakage oil adhesion portions when a three-layer structure of luminance having bright portions having different luminances and a dark portion is observed in the image.