A training method includes: obtaining an image and a distance image corresponding to the image; cutting a partial area out from the distance image obtained; generating an embedded image by pasting the partial area cut out from the distance image onto a predetermined area in the image, where the predetermined area is located at a position corresponding to the position of the partial area and has a size corresponding to the size of the partial area; and training a machine learning model, using training data including the embedded image as input data and the distance image as correct answer data.