  The result of a search for neutrino bursts from supernova explosions using
the Super-Kamiokande detector is reported. Super-Kamiokande is sensitive to
core-collapse supernova explosions via observation of their neutrino emissions.
The expected number of events comprising such a burst is ~10^4 and the average
energy of the neutrinos is in few tens of MeV range in the case of a
core-collapse supernova explosion at the typical distance in our galaxy (10
kiloparsecs); this large signal means that the detection efficiency anywhere
within our galaxy and well past the Magellanic Clouds is 100%. We examined a
data set which was taken from May, 1996 to July, 2001 and from December, 2002
to October, 2005 corresponding to 2589.2 live days. However, there is no
evidence of such a supernova explosion during the data-taking period. The 90%
C.L. upper limit on the rate of core-collapse supernova explosions out to
distances of 100 kiloparsecs is found to be 0.32 SN/year.
