The present invention provides a wholly aromatic liquid-crystalline polyester resin, consisting of the repeating units shown by the formulae [I]-[V]: wherein p, q, r, s and t represent molar proportion (mol %) of repeating units respectively in the liquid-crystalline polyester resin and satisfy the following formulae: 25≦p≦45; 2≦q≦10; 10≦r≦20; 10≦s≦20; 20≦t≦40; r>s; p+q+r+s+t=100; having a ratio P1/P2 of equal to or lower than 3.0, wherein P1 is a melt viscosity at a crystalline melting temperature measured under the condition of shear rate 1000 sec−1 and P2 is a melt viscosity at a temperature of the crystalline melting temperature +20° C. measured under the same condition as P1; and having a deflection temperature under load (DTUL) of equal to or higher than 230° C.