There is provided an image inspection apparatus capable of reliably removing a noise as a non-detection object and stably detecting a defect as a detection object, in which a first threshold setting device sets a minimum luminance value to be detected in a detection object image as a first threshold, a labeling processing device specifies blobs of pixels having luminance values larger than the first threshold from a multi-valued image acquired by an image pickup device, a second threshold setting device sets a second threshold that is larger than the first threshold, and a deletion device deletes the blob made up solely of luminance values smaller than the second threshold from all the blobs of the pixels specified by the labeling processing device and outputs the labeling processing image.