To provide an apparatus for producing granular crystals by a melting-dropping method (jet method), wherein the grain diameter of granular crystals is controlled by forming a special shape as a cross-sectional shape of the outlet of a nozzle hole in a nozzle section of a crucible which granularly discharges and drops a melt of a crystal material in.

The apparatus for producing granular crystals is equipped with a crucible 1 having a nozzle section d at the bottom so that a melt of a crystal material is granularly discharged and dropped from the nozzle section d, wherein the nozzle section d has a nozzle hole e of which the outlet has a nearly circular (elliptical) cross-sectional shape having parts with variation in curvature or a polygonal cross-sectional shape having rounded angular parts.

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