He had been one of the most trusted and sincere figure who founded the 15th Khordad foundation and served as an important member of the expediency council.
His funeral will be held on Saturday at Hosseinah Jamaran in Tehran on Saturday and then transferred to the holy city of Qom for burial at family chamber in a cemetery there.
Public masses, senior officials and scholars from seminaries and university are expected to attend his funeral.
Ayatollah Hassan Sane'ei stood by Imam through thick and thin times and took very active part in the struggle for the Islamic Revolution alongside his brother Sheikh Yousuf Sane'ei.
He undertook serious efforts to serve the country following the victory of the Islamic Revolution in 1979.