Abstract: A video signal processing device includes a first interpolation filter, a second interpolation filter, a frequency component detection circuit and a switching circuit. The first interpolated signal free from deterioration in a horizontal direction and the second interpolated signal permitting smooth interpolation in an oblique direction are selected in accordance with the horizontal frequency component of a picture pattern. Therefore, in the in-field interpolation processing for double-speed conversion, the horizontal resolution is not deteriorated for the image having a fine picture pattern and also smooth interpolation can be made for the image having an oblique component.