A painting work management device measures a position and a posture of a painting gun with respect to a surface to be painted, and calculates a formed film thickness distribution. The painting work management unit detects 3D data of the object to be painted, a distance of the painting gun with respect to the surface to be painted, an inclination angle and a moving speed of the painting gun, and accurately calculates the film thickness distribution formed on the surface to be painted based on a model formula representing a film thickness distribution pattern according to a shape of the surface to be painted in the 3D shape data of the object to be painted. When motion of the painting gun by the worker is abnormal, and when the film thickness distribution is insufficient or excessive, support is provided to prompt the worker to perform appropriate work.

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