LS I +61 ^ { \circ } 303 is one of the few high-mass X-ray binaries that have been recently observed at TeV and GeV energies .
Here we investigate the hard X-ray spectral and timing properties of this source using the IBIS/ISGRI instrument on-board the INTEGRAL satellite .
We carry out a systematic analysis based on all available INTEGRAL data since December 28 , 2002 up to April 30 , 2008 .
The total exposure time analyzed amounts to 2.1 Ms , hence more than doubling the previous reported sample .
The source is best detected in the 18-60 keV band , with a significance level of 12.0 \sigma .
The hard X-ray data are best fit with a simple power law with a photon index of \sim 1.7 \pm 0.2 .
We detect a periodical signal at 27 \pm 4 days , matching the orbital period of 26.496 days previously reported at other wavelengths .
The hard X-rays orbital lightcurve is obtained and compared with those derived at other frequencies .