Abstract: A bottle inspecting apparatus comprises means for conveying bottles while rotating the same; a first light source for exposing only the bottle finish with light; a second light source having a radiation spectrum different from that of the first light source for exposing the thread of the bottle neck; a filter for discriminating the light of the first light source scattered at the bottle finish and the light of the second light source scattered at the bottle finish and the thread of bottle neck from the second light source; a first photoelectric transducer for photoelectric array converting the light of the first light scattered at the bottle neck into a first output signal; a second photoelectric transducer for photoelectric array converting the scattered light of the second light source from the bottle finish and the thread of bottle neck into a second output signal; a first defect discriminating circuit for digitalizing the output signal from the first photoelectric transducer and for detecting the defect a