A program creation device includes training data including image data, a setting unit configured to set information of a frame specifying a region for each cell for detecting the presence or absence of the object from the image, and a learning unit configured to execute machine learning of the training data and to create a learned program for extracting the object from the image. The setting unit acquires information on a target region of the training data and on aspect ratios of the anchor, calculates a degree of matching between the anchor and the target region for each aspect ratio while changing a size of the anchor, and calculates an adoption rate of the target region whose degree of matching is a proportion no less than a threshold, and determines, based on a result of the calculation, the size of the anchor used in the learned program.