A tantalum sintered body comprising a pore size distribution having a plurality of peaks wherein out of a plurality of peaks, two peaks having a largest relative intensity and a second largest relative intensity have a pore diameter of 0.2 to 0.7 .mu.m and a pore diameter of 0.7 to 3 .mu.m, having a volume of pore 10 mm.sup.3 or more including the volume of pore voids and a specific area of 0.2 to 7 m.sup.2/g, and having a CV value of 40,000 to 200,000 .mu.FV/g when sintered at 1,300.degree. C., and a capacitor using the sintered body.

 
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