Ahmad Vahidi said invalid votes made up 5% of the total vote count.
Ineligible votes or those for non-nominated people also constitute 8% of the ballots, Vahidi said.
The interior minister said that the voter turnout is 41% and in some constituencies, where candidates failed to get the required minimum 20% of the votes cast, a run-off will be held in May.
In Tehran, which accounts for 30 seats in parliament, a second round will also be held for 16 seats.
