To provide an article inspection apparatus capable of sensitively and stably detecting a change in a spectrum when an unspecified foreign substance is contained and determining a defective product. A transport unit that transports a tablet for inspection to an article inspection position, a light irradiation unit that irradiates the tablet transported to the article inspection position with light, a light detection unit that detects light transmitted through the tablet, and an article inspection unit that inspects a quality of the tablet based on spectral characteristics of the light detected by the light detection unit are provided, and the article inspection unit standardizes a measured value of a spectrum of the light detected by the light detection unit for each wavelength and determines whether the tablet is a normal product or a defective product based on a standardized value.