Illumination device for appearance inspection, appearance inspection device, and blister packaging machine

Provided are a lighting device for appearance inspection, an appearance inspection device, and a blister packaging machine with which it is possible to significantly improve inspection efficiency and inspection accuracy when performing appearance inspection of an object. The appearance inspection device (45) includes an illumination unit (52) capable of irradiating light, a camera unit (53) capable of capturing an image of the PTP sheet irradiated with the light, and a control device (54). The control device (54) stores a neural network that has learned a correlation between the dimming parameter value and image data that can be acquired by capturing an image of a PTP sheet illuminated by a plurality of illumination panels (L1-L15) for emitting light at an illumination level corresponding to the dimming parameter value. Furthermore, predicted image data output after inputting the dimming parameter value into the neural network is compared with ideal image data, then an optimal dimming parameter value is speci