The title branched trisaccharides were synthesized from 1, 2, 2', 3, 3', 4', 6'-hepta-O-acetyl-β-maltose (1). A modified Koenigs-Knorr condensation of 1 with 2, 3, 4, 6-tetra-O-benzyl-α-D-galactopyranosyl chloride or 2, 3, 4, 6-tetra-O-acetyl-α-D-galactopyranosyl bromide afforded a protected trisaccharide having α-D-or β-D-galactosidic linkage at the C-6 hydroxyl group in maltose, respectively. The yield was 37 or 52% from 1. The configuration of new galactosidic linkages in the trisaccharides was confirmed by comparison of the molecular rotation of their corresponding undecaacetates with the value of calculation. Deacetylation of the undecaacetates afforded the title trisaccharides.