The video, posted on Twitter by @Koki915N, has been viewed more than 3 million times.
Local media said the train station is about half a mile from the mountains and the boar is believed to have wandered into town from the foothills. After running into a dead end between a pharmacy and a chain-link fence, the animal made a dash for freedom, upending the commuter, before biting him, goring him with its tusks and even going after his briefcase.
Two passing cars honked their horns in hopes of frightening the animal away.
The man was taken to a hospital, where he was treated for wounds on both legs, including a gash on his left thigh that needed eight stitches and one on his right knee that needed five stitches, the daily Mainichi Shimbun reported.
The boar was spotted later that day near the coast and killed by members of a local hunting club.
Only days after that attack, a man on a motorbike collided with a boar at night at Kyushu University in Fukuoka, breaking bones in four fingers.
Fukuoka Prefecture suffers considerable crop damage due to wild boars. The local government is working with area hunters to cull 1,500 boars a year, but it usually falls short of that target because of budget restrictions and a lack of hunters.
But when Japanese media reported that two boars had fallen into a dry reservoir in Kitakyushu in the same prefecture last month, the local government was surprised to be inundated with hundreds of calls asking for them to be rescued rather than killed. The boars were rescued and released back into the wild.
Akiko Kashiwagi contributed to this report.