The 51-year-old was arrested for theft while trying to escape from the site in southern Italy, Articolo Tre reported.
He had taken pieces of red plaster and fragments from an amphora handle as a "souvenir".
The latest theft comes just a few months after a tourist from Georgia was caught trying to steal tiles from a mosaic at the site, also to take home as a keepsake.
Giorgio Melani, from Guide Pompei, told The Local that the vast site is easy to steal from because there are few custodians guarding the relics.
But Giuseppe Galano, a tour guide at Visit Pompeii, believes some tourists visit the site specifically to leave with some of its “treasure”.
“I question whether they would do the same thing at home. They know Pompeii is famous and they want a piece of it,” he said, adding that the summer is peak season for theft.
“Especially on the first Sunday of each month when the entrance is free. About 14,000 people passed through the gates last Sunday; how can you control that?”
While the relics from the latest thefts are now back in safe hands, others from Pompeii have made it as far as eBay.
Just last week an Australian auction advertised a mosaic from the site, but the advert was quickly removed after it caught the attention of the Italian police
In January, a brick supposedly taken from the ruins in 1958 was also put up for sale on the online retail site for just $99, or a little over €70. The listing, which included four photos of the brick, soon caught the attention of online surfers and, eventually, the police.