To provide a picture frame provided with a mat board capable of enhancing the value of a work by improving a visual image of the work such as a photograph and a picture.

This is a picture frame provided with a mat board 2 with its opening end face formed with a dovetail groove-shaped slope. Then, plural stages of the mat boards 2 of whose lowermost one is the most projected, and one of which is made as a dovetail groove-shaped slope 3. The top face on the lowermost side of the plural stages of the mat board 2 may be properly colored. Further, on the surface of the mat board, a circular groove may be formed.