The death toll from Sunday's suicide bombing in an eastern Baghdad market reached more than 70, the Iraqi Health Ministry said on Monday.
The ministry said that more than 150 people had been injured in the attack in the Shiite Sadr City district of the capital.
The blast was claimed by the Islamic State Sunni extremist organization.
Prime Minister Haider al-Abadi visited the scene of the attack late on Sunday, a statement from his office said.
The premier vowed that what he called "cowardly criminal acts" would not deter the government from "continuing our victories and crushing these gangs."
Sunday also saw Islamic State attacks on security forces in several parts of the country.