The learning data generator (100, 100a, 100b) simulates radar irradiation on an object using a 3D model of the object, and generates an object simulated radar image which is a simulated radar image of the object. The generation unit (120, 120b), the background image acquisition unit (140) that acquires the background image using the radar image information generated by the radar irradiation by the radar device, and the background image acquisition unit (140) acquired the background image. An object simulated radar image generated by the object image generation unit (120, 120b) is pasted at a predetermined position in the background image to generate a composite pseudo radar image in which the background image and the object simulated radar image are combined. The image compositing unit (180, 180a, 180b), the composite simulated radar image information indicating the composite pseudo radar image generated by the image compositing unit (180, 180a, 180b), and the class information indicating the type of the object are associated with each other. It is provided with a learning data generation unit (190) that generates learning data.
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