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We report the detection, with the CANGAROO-III imaging atmospheric Cherenkovtelescope array, of a very high energy gamma-ray signal from the unidentifiedgamma-ray source HESS J1614-518, which was discovered in the H.E.S.S. Galacticplane survey. Diffuse gamma-ray emission was detected above 760 GeV at the 8.9sigma level during an effective exposure of 54 hr from 2008 May to August. Thespectrum can be represented by a power-law:8.2+-2.2_{stat}+-2.5_{sys}x10^{-12}x (E/1TeV)^{-Gamma} cm^{-2} s^{-1} TeV^{-1}with a photon index Gamma of 2.4+-0.3_{stat}+-0.2_{sys}, which is compatiblewith that of the H.E.S.S. observations. By combining our result withmulti-wavelength data, we discuss the possible counterparts for HESS J1614-518and consider radiation mechanisms based on hadronic and leptonic processes fora supernova remnant, stellar winds from massive stars, and a pulsar windnebula. Although a leptonic origin from a pulsar wind nebula driven by anunknown pulsar remains possible, hadronic-origin emission from an unknownsupernova remnant is preferred.

CANGAROO-III observation of TeV gamma rays from the unidentified gamma-ray source HESS J1614-518