To easily inspect the cover tape of an embossed tape in a short time by eliminating the difficulty of setting the threshold value of judging the quality or a problem point such as noise.

The method for inspecting the cover tape of an embossed tape comprises the steps of disposing a light source 5 sidewise or obliquely above of the flat surface of the cover tape 2 so as to reflect the emitting light of the source 5 by the tape 2 without emitting the light to a surface mounting component sealed in the embossed tape and to strengthen the contrast of the brightness on the uneven part of the flat surface of the tape 2, capturing the image of the embossed tape by a camera 4 disposed oppositely to the flat surface of the cover tape, forming the histogram of the lightness, deciding the threshold value from the distribution, forming the processed image converted to different one gradation on the region of the histogram divided by the threshold value, and examining whether there exists the pixel of the different gradation near the constituting part of the image or not.