To provide an image processing device performing swing analysis with high accuracy by a simple system structure.

From one or more groups of asynchronous moving images obtained by photographing an object which performs swing actions from a plurality of directions including front and back directions, a static image for each of the groups is generated. A static image wherein an action scene in one of the generated static images and an action scene of another static image corresponding to the action scene are synchronized is memorized. A head position in a swing action of the object photographed in the memorized static image is inputted, and a head speed is calculated based on the distance between the adjacent heads out of a plurality of head positions inputted to display the calculated head speed.

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