1. A laser welding inspection device comprising: an imaging device which receives reflected laser light that is the irradiation of laser light reflected by a welding portion and which images the welding portion by means of the reflected laser light received; a first lens unit and a second lens unit that are arranged in this order and placed between the welding portion and the imaging device, the first and the second lens units passing at least the reflected laser light between the irradiation and the reflected laser light of the welding portion; and a protection glass that is placed between the first lens unit and the welding portion so as to protect the first and the second lens unit, the laser welding inspection device inspecting welding quality using a welding portion image acquired from the imaging of the imaging device, wherein at least one image formation point for the welding portion is provided between the imaging device and the welding portion such that an image formation point for the protection glass does not coincide with the imaging device, and the image formation point for the welding portion is provided between the first lens unit and the second lens unit.