The woman was in her car in central Kumla when the man in his 30s attacked with a knife-like object.
An ambulance was called to the scene, but the woman’s injuries are not life-threatening, according to the police.
– It’s just lucky that it didn’t get worse than it did, says Lars Hedelin, press informer at the police in Region Bergslagen.
The police are now looking for tips from the public.