  We report the superconducting properties of the pyrochlore oxide Cd2Re2O7.
The bulk superconducting transition temperature Tc is about 1.0 K, and the
upper critical field Hc2 determined by the measurement of specific heat under
magnetic fields is 0.29 T. The superconducting coherence length is estimated to
be 34 nm. Specific heat data measured on single crystals suggest that the
superconducting gap of Cd2Re2O7 is nodeless.
