The IRNA news agency reported the toll in the bombing Wednesday in Sistan and Baluchistan province.
Jaish al Adl group claimed responsibility for the attack via its telegram channel.
The latest attack, one of the deadliest ever carried out against the top military force, comes as Iran is trying to parry what it sees as a US-led war on its economy after Washington re-imposed crippling sanctions against the country.
The statement does not give the exact number of the martyred soldiers and the injured.
Jaish al-Adl claimed Wednesday's bombing in a statement online.
A coordinated June 7, 2017 ISIS group assault targeted the Iranian parliament and the shrine of Ayatollah Ruhollah Khomeini, the leader of Iran's 1979 Islamic Revolution. In September, Iran fired missiles into Iraq targeting a base of an Iranian Kurdish separatist group after an attack on a border post.
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And in early December a year ago two people were killed and around 40 others wounded in the port city of Chabahar, also in Sistan-Baluchistan, in an attack which Foreign Minister Mohammad Javad Zarif at the time blamed on "foreign-backed terrorists" - a reference to Sunni Muslim extremists.
Iranian officials have blamed Saudi Arabia and the United States for stirring up dissent in the country. Prince Mohammed is due in Pakistan, a major recepient of the kingdom's largess, in the coming days.
In a tweet, Iranian Foreign Affairs Minister Javad Zarif, who has been critical of the Warsaw gathering, obliquely implied there could be a connection between the summit and the attack on the Revolutionary Guards. "U.S. seems to always make the same wrong choices, but expect different results", Iranian foreign minister Javad Zarif said in reaction to the attack.
"Especially when cohorts of same terrorists cheer it from Warsaw streets & support it with twitter bots?" Trump withdrew the US from the accord last May.
Khamenei, who earlier approved President Hassan Rouhani's outreach to the West during the nuclear deal negotiations, dismissed any future dealings with the U.S.
Iranian border guards have repeatedly come under attacks by terror outfits active on the Pakistani soil.
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