[Problem] To provide a wholly aromatic liquid crystalline polyester resin having an excellent heat resistance and processability 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 p-hydroxybenzoic acid, structural unit (II) derived from 6-hydroxy-2-naphthoic acid, structural unit (III) derived from an aromatic diol compound, structural unit (IV) derived from an aromatic dicarboxylic acid, wherein the composition ratio (mol %) of said structural units (I) to (IV) satisfies the following conditions: 2 mol %≤structural unit (I)≤9 mol % 40 mol %≤structural unit (II)≤75 mol % 9 mol %≤structural unit (III)≤24 mol % 9 mol %≤structural unit (IV) 24 mol %.