The incident took place at about 1:10 p.m. in a parking lot in the 1400 block of North Ethridge Lane, south of West Fairview Avenue.
The child, a boy nearly 2 years old, was running ahead of his mother and didn't see the car enter the parking lot, said Lynn Hightower, spokeswoman for the Boise Police Department. The boy was knocked down but was not injured, she said.
The boy was taken to a local hospital as a precaution, she said.
The driver did not see the boy dart out.
No citations were issued, Hightower said.