Provided is a resin composition which comprises 100 parts by weight of a polyamide resin comprising a structural unit derived from diamine and a structural unit derived from dicarboxylic acid, in which 70 mol % or more of the structural unit derived from diamine is derived from xylylenediamine, and in which 70 mol % or more of the structural unit derived from dicarboxylic acid is derived from a straight-chain aliphatic α,ω-dicarboxylic acid having 4 to 20 carbon atoms; 3 to 17 parts by weight of an acid-modified polyolefin having an acid modification ratio of 0.3 to 5.0% by weight; and 1 to 15 parts by weight of a compound represented by formula (1), wherein R1 represents an alkyl group having 1 to 10 carbon atoms, R2 represents an alkyl group having 2 to 12 carbon atoms, and n represents an integer of 1 to 3.