Columnar-shaped La3Ta0.5Ga5.5O14 single crystals with a-axis and c-axis crystal orientations along the growth direction grown by the micro-pulling-down method and their physical properties were investigated. All diffraction peaks of the XRD pattern were identified as the langasite-type structure and the a-axis and c-axis lengths were a=8.239 angstrom and c = 5.124 angstrom, respectively. In the XRC measurement, a relatively sharp single peak was observed in the omega scan and the full width of half maximum was 82.1 arcsec. According to the chemical analysis by the EPMA system, the main phase was composed of LTG with the cation ratio of La:Ta:Ga = 3.31:0.465:5.22 and the LTG crystal included secondary phase, La-Ta-O system, in the periphery area. The piezoelectric constant d(11) that was measured using the plate-shape LTG crystal was 6.7 pC/N. (c) 2012 Published by Elsevier B.V.