It was the resident who raised the alarm when it suddenly exploded in the house, says the police's press spokesperson Ola Österling.
The bullet has gone in through an exterior wall and in between two cabinets.
The incident occurred on Saturday afternoon on an island in Norrtälje archipelago.
It became a natural operation where one also went through this plaintiff's history, because one wondered if he had a threat against him.
The shot got its explanation when the man mentioned that he had seen hunters in the vicinity.
In the end, one has found out who it was. This person has aimed at a deer and not thought about what is behind the deer, missed, and then the bullet has gone into the house, says Österling.
The bullet has been seized.