The missiles were fired from western Iran across the border into Deir Ezzor province, in northeastern Syria, targeting what the Guard called "terror bases".
The Guard said, in a statement published on its Sepahnews website, that the missiles were "in retaliation" for the June 7 attacks on Tehran claimed by IS.
"Medium-range missiles were fired from the (western) provinces of Kermanshah and Kurdestan, and a large number of terrorists were killed and weapons destroyed," the statement said.
On June 7, gunmen and suicide bombers attacked the parliament complex and the shrine of revolutionary leader Ayatollah Ruhollah Khomeini in Tehran, killing 17 people.
The Islamic State group claimed responsibility.
The Islamic Revolutionary Guard Corps, which accused Saudi Arabia of involvement in the attacks, vowed to avenge the bloodshed.
Senior Iranian officials had also put the blame on Riyadh after the Tehran attacks, saying Saudi Arabia was "promoting terrorist groups" in Iran.
The Islamic republic of Iran is a key ally of the Syrian regime of President Bashar al-Assad, alongside Russia and the Iran-backed Hezbollah movement of Lebanon.
According to a report published in March, some 2,100 combatants sent by Iran have died in Syria and Iraq.
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