The man was sitting in a car in the camping area, along with some others, when the group was attacked by several people.
During the altercation, the man was stabbed in the chest with an unknown object.
"Several people were involved in the attack on this man," Bengt Netterström, duty officer with the Jönköping County police, said to newspaper Aftonbladet.
The man was taken to a nearby hospital, but died from his injuries about an hour later.
Police first received reports of the stabbing just before midnight, and have since conducted a large number of interrogations throughout the night.
A forensic investigation of the crime scene has also been carried out, but a suspect is yet to be found for the crime.
The campground where the fight took place was the site of a large bikers' meet up taking place all weekend.
Roughly 5,000 bikers were in the area, as well as a large number of police officers.
"There was a lot of people affiliated with different motorcycle clubs attending, which was why we had a number of police officers there even before the event," Gunnar Rydholm of the Jönköping police told Aftonbladet.
The police have now commenced preliminary investigations of manslaughter.