"We came to Syria to announce that our support for the Syrian regime is firm and eternal," said Alaedin Boroujerdi, head of the Iranian parliament's national security and foreign policy, at a press conference concluding his two-day visit.
He said Syria and Iran "have close and strategic ties... and there is ongoing communication between the two countries' defence ministers".
Iran is the closest regional ally of Syria's embattled regime and supports it financially and militarily. It has dispatched military advisers to Damascus to help Syria's army cope with the four-year conflict.
Boroujerdi congratulated Syria's army and the Lebanese Shiite movement Hezbollah, which has intervened in Syria on behalf of the regime, on recent victories in the Qalamun region, which lies north of Damascus and borders Lebanon.
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Regime and Hezbollah fighters took control yesterday of the highest hilltop in Qalamun, which overlooks the Lebanese-Syrian border.
Boroujerdi's trip included meetings with Syrian President Bashar al-Assad, Prime Minister Wael al-Halqi, and Foreign Minister Walid Muallem, as well as other officials.
"There is no good terrorist and bad terrorist -- terrorism is terrorism, wherever it is," he said.