A resin composition comprising a thermoplastic resin and an inorganic filler, wherein said thermoplastic resin is a liquid crystalline aromatic polyester having a repeating unit, a repeating unit and a repeating unit: -O-Ar 1 -CO- -CO-Ar 2 -CO- -X-Ar 3 -Y- -Ar 4 -Z-Ar 5 - wherein, in the formulas, Ar 1 represents a phenylene group, a naphthylene group or a biphenylylene group; Ar 2 and Ar 3 each independently represent a phenylene group, a naphthylene group, a biphenylylene group or a group represented by the above formula; X and Y each independently represent an oxygen atom or an imino group (-NH-); Ar 4 and Ar 5 each independently represent a phenylene group or a naphthylene group; Z represents an oxygen atom, a sulfur atom, a carbonyl group, a sulfonyl group or an alkylidene group; and hydrogen atoms of Ar 1, Ar 2 or Ar 3 may each independently be substituted with a halogen atom, an alkyl group or an aryl group, wherein a water absorption rate of said inorganic filler in atmospheric air at a temperature of 25°C and a relative humidity of 50% is 0.05% by mass or more and 2.0% by mass or less, wherein said water absorption rate is a value obtained by a thermogravimetric analysis method for the inorganic filler which is placed under an environment at a temperature of 25°C and a relative humidity of 50% for a period of time which is equal to or longer than the time required for the amount of moisture contained in the inorganic filler to reach equilibrium, and the thermogravimetric analysis is carried out by raising the temperature from 25°C to 600°C at a temperature increase condition of 10°C/min using a thermogravimetric analyzer, and by calculating the water absorption rate based on formula from the mass ratio of the inorganic filler before and after the temperature increase: Water absorption rate % = 1 − mass of inorganic filler after temperature increase mass of inorganic filler before temperature increase × 100 wherein said inorganic filler is at least one selected from the group consisting of titanium oxide, talc and mica, and wherein a content of the thermoplastic resin is 80 parts by mass or more and 99 parts by mass or less, and a content of said inorganic filler is 1 part by mass or more and 20 parts by mass or less, with respect to 100 parts by mass of said resin composition. wherein said thermoplastic resin is a liquid crystalline aromatic polyester having a repeating unit, a repeating unit and a repeating unit: -O-Ar 1 -CO- -CO-Ar 2 -CO- -X-Ar 3 -Y- -Ar 4 -Z-Ar 5 - wherein, in the formulas, Ar 1 represents a phenylene group, a naphthylene group or a biphenylylene group; Ar 2 and Ar 3 each independently represent a phenylene group, a naphthylene group, a biphenylylene group or a group represented by the above formula; X and Y each independently represent an oxygen atom or an imino group (-NH-); Ar 4 and Ar 5 each independently represent a phenylene group or a naphthylene group; Z represents an oxygen atom, a sulfur atom, a carbonyl group, a sulfonyl group or an alkylidene group; and hydrogen atoms of Ar 1, Ar 2 or Ar 3 may each independently be substituted with a halogen atom, an alkyl group or an aryl group, wherein a water absorption rate of said inorganic filler in atmospheric air at a temperature of 25°C and a relative humidity of 50% is 0.05% by mass or more and 2.0% by mass or less, wherein said water absorption rate is a value obtained by a thermogravimetric analysis method for the inorganic filler which is placed under an environment at a temperature of 25°C and a relative humidity of 50% for a period of time which is equal to or longer than the time required for the amount of moisture contained in the inorganic filler to reach equilibrium, and the thermogravimetric analysis is carried out by raising the temperature from 25°C to 600°C at a temperature increase condition of 10°C/min using a thermogravimetric analyzer, and by calculating the water absorption rate based on formula from the mass ratio of the inorganic filler before and after the temperature increase: Water absorption rate % = 1 − mass of inorganic filler after temperature increase mass of inorganic filler before temperature increase × 100 wherein said inorganic filler is at least one selected from the group consisting of titanium oxide, talc and mica, and wherein a content of the thermoplastic resin is 80 parts by mass or more and 99 parts by mass or less, and a content of said inorganic filler is 1 part by mass or more and 20 parts by mass or less, with respect to 100 parts by mass of said resin composition.