Aliphatic-aromatic polyester resin and molded item thereof

The present invention provides an aliphatic-aromatic polyester resin in which the main constituent units are aliphatic dicarboxylic acid units, aromatic dicarboxylic acid units, and aliphatic diol units and/or alicyclic diol units, the abundance ratio (molar ratio) between the aliphatic dicarboxylic acid units and the aromatic dicarboxylic acid units being 15:85 to 85:15, the aliphatic-aromatic polyester resin having a glass transition temperature of -25 DEG C or above, and the aliphatic-aromatic polyester resin having a branched structure represented by the following formulas (1) to (4). (In formulas (1) to (4), Ar1, Ar2, and Ar3 independently represent a C4-12 divalent aromatic hydrocarbon ring group or an aromatic heterocyclic group that may have a substituent. R represents a hydrogen atom or a C1-4 alkyl group, and n, m, and r independently represent an integer of 2 to 10).