The authors made observations of SS433 covering the entire primary optical minimum phase in the binary period X-ray astronomy satellite Ginga. The light curve obtained by the present observations revealed ingress and egress of the compact X-ray source. If the duration of the eclipse is due to occultation of the blue jet by the normal companion star, one can determine the radius of the companion star to be about 60% of the binary separation. Assuming the companion star to be filling its Roche lobe, the ratio of the mass of the compact object to that of the companion star is found to be 0.1. Combined with the previous results from optical spectroscopy, the mass of the compact object in SS433 is determined to be 1 - 2 M_sun;.
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