To improve the brightness (illuminance) of commodity sample by arranging a reflection plate at the rear part of a specified position, reflecting a radiation light beam by the reflection plate and guiding it to the inner part of commodity sample.

A rear part reflection plate 30 guides the reflection light beam to the inner part of a hollow body 11 by its reflecting part 302 and increases light quantity to illuminate a commodity sample 1. The rear part reflection plate 30 is arranged at the position on the opposite side of a front surface part 53 in a sample supporting part 5 with a light source as reference, where the downward radiation light beam from a horizontal surface adding the lower end of the light source 2 is not substantially shielded, so that direct illumination to the front surface part 53 and a lower part area (the commodity sample, etc., arranged below, for example) by the light source 2 is not prevented. The front part reflection plate 31 arranged, at need, in addition to the rear part reflection plate 30, guide reflectionlight into the inner part of the commodity sample 1 while securing the sufficient illuminance of the front surface part 53 by projecting the direct light beam from the light source 2 on the front surface part 53 of the sample supporting part 5.