A picture processing device adapted to correct displacement between pictures having an ultrawide angle of view obtained by temporally-continuous capturing, said picture processing device comprising: a rotational motion amount calculating unit configured to calculate a rotational motion amount indicating a rotational displacement amount of a second picture with respect to a first picture, the rotational displacement amount being obtained based on a combination of axis rotational directions of mutually perpendicular three axes, and the second picture being captured temporally after the first picture; a cutout picture generating unit configured to generate a first cutout picture from the first picture and a second cutout picture from the second picture; a parallel motion amount calculating unit configured to calculate a parallel motion amount indicating a displacement amount of the second cutout picture with respect to the first cutout picture; a motion amount determining unit configured to determine, based on the calculated rotational motion amount and the calculated parallel motion amount, a motion amount indicating a displacement amount of the second picture with respect to the first picture; and a correcting unit configured to correct the displacement amount of the second picture with respect to the first picture, based on the motion amount, wherein said cutout picture generating unit is configured to (i) cut out from the first picture a predetermined first area, and generate the first cutout picture by performing, based on characteristics of an optical system used for capturing, distortion correction on the predetermined first area which is cut out, and (ii) cut out from a first corrected picture a second area corresponding to the predetermined first area, and generate the second cutout picture by performing the distortion correction on the corresponding second area which is cut out, the first corrected picture being generated from the second picture whose rotational displacement amount, in the combination of the three-axis rotational directions, is corrected based on the calculated rotational motion amount. a rotational motion amount calculating unit configured to calculate a rotational motion amount indicating a rotational displacement amount of a second picture with respect to a first picture, the rotational displacement amount being obtained based on a combination of axis rotational directions of mutually perpendicular three axes, and the second picture being captured temporally after the first picture; a cutout picture generating unit configured to generate a first cutout picture from the first picture and a second cutout picture from the second picture; a parallel motion amount calculating unit configured to calculate a parallel motion amount indicating a displacement amount of the second cutout picture with respect to the first cutout picture; a motion amount determining unit configured to determine, based on the calculated rotational motion amount and the calculated parallel motion amount, a motion amount indicating a displacement amount of the second picture with respect to the first picture; and a correcting unit configured to correct the displacement amount of the second picture with respect to the first picture, based on the motion amount, wherein said cutout picture generating unit is configured to (i) cut out from the first picture a predetermined first area, and generate the first cutout picture by performing, based on characteristics of an optical system used for capturing, distortion correction on the predetermined first area which is cut out, and (ii) cut out from a first corrected picture a second area corresponding to the predetermined first area, and generate the second cutout picture by performing the distortion correction on the corresponding second area which is cut out, the first corrected picture being generated from the second picture whose rotational displacement amount, in the combination of the three-axis rotational directions, is corrected based on the calculated rotational motion amount.