The girl was hit by a lorry at an intersection and injured critically.
The accident took place at a pedestrian crossing at the intersection of Pirkankatu and Mariankatu on Monday morning, the police said.
The lorry running on Pirkankatu and heading towards the city centre made a right turn to Mariankatu and hit the girl who was heading the same direction walking across the pedestrian crossing.
Police are investigating the case as aggravated endangering of traffic safety and cause to grievous bodily injury.
The police are also investigating whether traffic light on both sides of pedestrian crossing displayed green light.