Apparatus for the inspection of food product samples, in particular packaged raw fish products, comprising: - a box-like frame which delimits an inspection chamber; - feed means configured to feed the samples to be inspected into said chamber; - removal means configured to remove the inspected samples from said chamber; - a transparent support plane, disposed in said inspection chamber and aligned with said feed and removal means and configured to support at least one sample; - at least two light sources (6a, 6b) disposed on opposite sides of the plane and each configured to emit a beam of light toward said at least one sample supported on said plane; - at least two visual inspection devices (15a, 15b) disposed on opposite sides of said plane, each configured to cooperate with one of said light sources (6a, 6b) in an opposite position to acquire a backlit image of the sample; - a processing unit connected to said visual inspection devices (15a, 15b) and configured to alternatively activate or deactivate said visual inspection devices (15a, 15b) and said light source (6a, 6b) cooperating reciprocally, and process the images acquired; - a display device configured to display said images acquired, characterized in that it comprises: - opaque reference elements provided on said plane, able to be acquired by said visual inspection devices (15a, 15b) together with said backlit images of said food product, wherein said processing unit is configured to generate an overlapping image of said first image and said second image according to said acquired reference elements. - a box-like frame which delimits an inspection chamber; - feed means configured to feed the samples to be inspected into said chamber; - removal means configured to remove the inspected samples from said chamber; - a transparent support plane, disposed in said inspection chamber and aligned with said feed and removal means and configured to support at least one sample; - at least two light sources (6a, 6b) disposed on opposite sides of the plane and each configured to emit a beam of light toward said at least one sample supported on said plane; - at least two visual inspection devices (15a, 15b) disposed on opposite sides of said plane, each configured to cooperate with one of said light sources (6a, 6b) in an opposite position to acquire a backlit image of the sample; - a processing unit connected to said visual inspection devices (15a, 15b) and configured to alternatively activate or deactivate said visual inspection devices (15a, 15b) and said light source (6a, 6b) cooperating reciprocally, and process the images acquired; - a display device configured to display said images acquired, characterized in that it comprises: - opaque reference elements provided on said plane, able to be acquired by said visual inspection devices (15a, 15b) together with said backlit images of said food product, wherein said processing unit is configured to generate an overlapping image of said first image and said second image according to said acquired reference elements. - opaque reference elements provided on said plane, able to be acquired by said visual inspection devices (15a, 15b) together with said backlit images of said food product, wherein said processing unit is configured to generate an overlapping image of said first image and said second image according to said acquired reference elements.