To provide an inspection device capable of precisely and quickly determining the quality of welding.

The inspection device is provided with one imaging means installed at a prescribed position and imaging an inspection object including a welded part 4 and the surrounding part, a projection means projecting a regular light pattern P (Fig. 3(B)) to the inspection object, and an evaluation means. The evaluation means takes first imaging data of the inspection object with projection of the light pattern P by the imaging means and second image data of the inspection object without projection of the light pattern P by the imaging means, recognizes a three-dimensional welded part profile 4a from the first image data, and complements the area where the three-dimensional welded part profile 4a cannot be recognized with a two-dimensional welded part profile 4a recognized on the basis of the second image data. The quality of the welding is determined from the finally completed three-dimensional welded part profile 4a.