[Problem] To provide a wholly aromatic liquid crystalline polyester resin having an excellent heat resistance while having an extremely low dielectric tangent [Solving means] A wholly aromatic liquid crystalline polyester resin according to the present invention comprises, structural unit (I) derived from 6-hydroxy-2-naphthoic acid, structural unit (II) derived from an aromatic diol compound, structural unit (III) derived from an aromatic dicarboxylic compound, wherein structural unit (III) comprises structural unit (III A) derived from terephthalic acid, and at least one of structural unit (III B) derived from 2,6-naphthalene dicarboxylic acid and structural unit (III C) derived from isophthalic acid, wherein the composition ratio (mol %) of said structural units is characterized by satisfying the following conditions: 40 mol % ‰¤structural unit (I) ‰¤ 80 mol % 10 mol % ‰¤structural unit (II) ‰¤ 30 mol % 3 mol % ‰¤ structural unit (III A) ‰¤ 28 mol % 0 mol % ‰¤ structural unit (III B) ‰¤ 9 mol % 0 mol % ‰¤ structural unit (III C) 5 mol % (provided that both of structural unit (III B) and structural unit (III C) is not 0 mol %).
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