A tire deformation amount calculation device, an overload detection system, and a tire deformation amount calculation method capable of practically detecting deformation of a tire of a vehicle due to overload are provided. According to one embodiment, a tire deformation amount calculation device comprises: detection means for detecting a side profile of a tire of a wheel included in a vehicle from a photographed image; calculation means for calculating a load deformation amount of the side contour according to the weight of the vehicle; Specification means for specifying the shape or pattern of a circular shape or regular polygon shape in a plane parallel to the outline, and a conversion value for converting the shape in the photographed image of the specified shape or pattern into a true circle or a regular polygon Conversion value obtaining means for obtaining, the calculation means converts the predetermined value relating to the load deformation amount of the tire in the photographed image using the obtained conversion value, and the load deformation amount based on the converted predetermined value Calculate [Selected figure] Figure 5
展开▼
