  We report results of a search for the invisible decay of the Upsilon(1S) via
the Upsilon(3S)->pi+pi-Upsilon(1S) transition using a data sample of 2.9
fb^{-1} at the Upsilon(3S) resonance. The data were collected with the Belle
detector at the KEKB asymmetric-energy e+e- collider. No signal is found, and
an upper limit for the branching fraction at the 90% confidence level is
determined to be B(Upsilon(1S)->invisible) < 2.5x10^{-3}.
