The object of the present invention is to provide the following devices: a dripping nozzle device that forms substantially spherical ADU particles, a dripping stock solution recovery device that prepares a homogeneous dripping stock solution, a dripping stock solution supply device that can drop liquid droplets of a uniform volume, and even liquid droplets Droplet surface solidification device that does not deform when it collides with the surface of ammonia solution when dropped, ammonia solution circulation device that can fully turn uranyl nitrate into ADU from the center of the droplet, and ADU with good sphericity The ADU particle manufacturing device for particles, the dripping nozzle device has an exciter that vibrates multiple nozzles at the same time, the dripping stock solution recovery device recovers the bottom fine stock solution in the nozzle and mixes it into the dripping stock solution, and the dripping stock solution supply device has a mechanism for falling The light irradiation mechanism that irradiates the droplet of the original solution with light, the droplet surface curing device sprays ammonia gas toward the drop path of the droplet of the original solution dripped from the nozzle, and the ammonia solution circulation device can make the droplets in the ammonia solution storage tank The ammonium diuranate particle manufacturing device uses the above-mentioned device for ascending flow in the ammonia solution in the interior.