Results of simultaneous INTEGRAL and optical observations of galactic microquasar SS433 in May 2003 are presented .
The analysis of the X-ray and optical eclipse duration and hard X-ray spectra obtained by INTEGRAL together with optical spectroscopy obtained on the 6-m telescope allows us to construct a model of SS433 as a massive X-ray binary .
X-ray eclipse in hard X-rays has a depth of \sim 80 \% and extended wings .
The optical spectroscopy allows us to identify the optical companion as a A5-A7 supergiant and to measure its radial velocity semi-amplitude K _ { v } = 132 km/s .
A strong heating effect in the optical star atmosphere is discovered spectroscopically .
The observed broadband X-ray spectrum 2-100 keV can be described by emission from optically thin thermal plasma with kT \sim 15 - 20 keV