To accurately and rapidly perform the inspection of the printing state of inspection paper by taking out the inspection paper not sufficiently dried immediately after printing to correct the position thereof and to prevent the generation of the defectiveness of a printing line on and after.

Selectively extracted multi-sided large-sized paper 2 to be inspected is placed on a paper placing plate 3 while sucked, and the paper positioning mark of the multi-sided large-sized paper 2 and the specific image in a specific image region are read in a non-contact state in an image reading part 4. The correction quantity between the position of the positioning mark and the position of the standard positioning mark preliminarily held to a standard data holding part 6 is calculated in an image processing part 5. The paper placing plate 3 is moved on the basis of the correction quantity to correct the position of the multi-sided large-sized paper 2 and the printing state of the multi-sided large-sized paper 2 is discriminated by stage according to the degree of the difference between the specific image after correction and the standard specific image preliminarily held to the standard data holding part in a printing state judge processing part 7 to display or print the discriminated content.