NOVELTY - The apparatus has auger (13) to scrape off low-temperature fluid of solid form produced on heat transfer plane (11) of heat exchanger (12), and extremely-low temperature fluid generation unit (3) to supply extremely low temperature fluid whose temperature is less than low-temperature liquid of fluid form held within vessel to interior of heat transfer plane. Flow-rate, temperature of extremely low temperature fluid, and rotational speed of the auger are regulated based on particle diameter of scraped solid form fluid.    USE - For manufacturing slush fluid e.g. slush hydrogen used as fuel for fuel cell vehicle and hydrogen fueled car.    ADVANTAGE - Increases the weight solidification ratio of slush fluid, while reducing evaporation of hydrogen in vehicle-mounted hydrogen tank and improving hydrogen utilization efficiency. The slush-fluid manufacturing efficiency is improved.    DETAILED DESCRIPTION - The apparatus has heat exchanger (12) with heat transfer plane in low-temperature fluid (L) held within vessel (10), auger to scrape off low-temperature fluid of solid form produced on heat transfer plane, and extremely-low temperature fluid generation unit to supply extremely low temperature fluid whose temperature is less than low-temperature liquid of fluid form held within vessel to interior of heat transfer plane. A bearing supports the rotary shaft of the auger. Flow-rate, temperature of extremely low temperature fluid, and rotational speed of the auger are regulated based on particle diameter of scraped solid form fluid. INDEPENDENT CLAIMS are also included for the following:    (1) low-temperature slush fluid storage facility comprising a transfer unit to transfer low-temperature slush fluid from the bottom of vessel to fluid storage tank; and    (2) low-temperature slush fluid storage apparatus that comprises fluid storage tank in which low-temperature slush fluid having desired weight solidification rate is stored.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of slush fluid manufacturing apparatus.    Extremely-low temperature fluid generation unit (3)    Vessel (10)    Heat transfer plane (11)    Heat exchanger (12)    Auger (13)    Low-temperature fluid (L)