  We study the influence of jet structure on the curvature effect in a
GRB-lightcurve. Using a simple model of jet emissivity, we numerically
calculate lightcurves for a short flash from a relativistic outflow having
various profiles of the Lorentz factor and outflowing energy density (gaussian,
core+power-law). We find that for "on-beam" viewing geometry, with the line of
sight passing through the bright core of the outflow, the shape of the
lightcurve practically does not depend on the jet structure, initially
following the temporal slope 2+delta, where delta is the spectral index. When
the viewing angle is larger than the core, the light curve decaying slope is
shallower. We discuss the implications of our results for the Swift data.
