A separation filter selection device comprising: an image input unit for inputting a captured image of a tire surface, the image including a characteristic portion; a memory unit configured to store a plurality of filters adapted to perform image processing of the captured image, to store a predetermined training image that corresponds to an image in which the characteristic portion has been separated from the captured image as a result of image processing of the captured image using the plurality of filters, and to store a weighted image in which a weighting is set to a predetermined region of the captured image, the weighted image being an image adapted to apply a weighting to predetermined regions in which high precision inspection is required during tire inspection; a setting unit configured to set as a separation filter a filter group combining two or more filters from the plurality of filters stored in the memory unit; an evaluation unit (6 configured to perform image processing of the captured image with each of the two or more filters of the separation filter, and to calculate an evaluation value of the separation filter on the basis of an image that is a differential image between a processed image after image processing and the training image and to which a weighting based on the weighted image is applied; and a separation filter selection unit configured to repeat the setting of the setting unit and the evaluation value calculation of the evaluation unit until the evaluation value is within a predetermined specific range, and to select a separation filter corresponding to the evaluation value resulting from the repeated calculation as a separation filter for separating the characteristic portion from the captured image. an image input unit for inputting a captured image of a tire surface, the image including a characteristic portion; a memory unit configured to store a plurality of filters adapted to perform image processing of the captured image, to store a predetermined training image that corresponds to an image in which the characteristic portion has been separated from the captured image as a result of image processing of the captured image using the plurality of filters, and to store a weighted image in which a weighting is set to a predetermined region of the captured image, the weighted image being an image adapted to apply a weighting to predetermined regions in which high precision inspection is required during tire inspection; a setting unit configured to set as a separation filter a filter group combining two or more filters from the plurality of filters stored in the memory unit; an evaluation unit (6 configured to perform image processing of the captured image with each of the two or more filters of the separation filter, and to calculate an evaluation value of the separation filter on the basis of an image that is a differential image between a processed image after image processing and the training image and to which a weighting based on the weighted image is applied; and a separation filter selection unit configured to repeat the setting of the setting unit and the evaluation value calculation of the evaluation unit until the evaluation value is within a predetermined specific range, and to select a separation filter corresponding to the evaluation value resulting from the repeated calculation as a separation filter for separating the characteristic portion from the captured image.