An inspection apparatus is provided for inspecting a package having a content wrapped with a translucent packaging sheet, the package having an outline including front and rear edges and two side edges and having a seal where the packaging sheet is sealed formed inside at least one of the front and rear edges. The inspection apparatus includes a lighting disposed on one side of a gap across which the package is to be conveyed from an upstream conveyor mechanism to a downstream conveyor mechanism, a camera disposed on the other side of the gap, and an image processor for processing an image captured by the camera. The image processor is capable of obtaining a strip-shaped partial image including the seal from an entire image of the package, thereby enabling determination of whether a foreign substance is present in the partial image.