Mohammed Sohel Rana was arrested by the elite Rapid Action Battalion in the border town of Benapole.
Rana Plaza, which housed factories making low-cost garments for Western retailers, caved in last Wednesday.
Bangladesh television showed Rana being flown by helicopter to the capital Dhaka, where he will face charges of faulty construction and causing unlawful death.
Authorities put the latest death toll at 377, with hundreds still unaccounted for.
Stones turn back the clock
For one night only the Rolling Stones were an up-and-coming band again.
The group rocked a small club in Los Angeles at the weekend for a minuscule crowd compared to the thousands set to see them launch their 50 And Counting anniversary tour on May 3 at the Staples Centre.
"Welcome to Echo Park, a neighbourhood that's always coming up – and I'm glad you're here to welcome an up-and-coming band," Mick Jagger joked after the second song, Respectable.
A fire has destroyed large areas of the Museum of Danish Resistance in Copenhagen.
Firefighters and staff managed to save the majority of artefacts.
The fire started in the museum cafe early yesterday day and quickly spread to the exhibition hall. The museum exhibits objects related to the Danish resistance to the German occupation during the Second World War.
Daft Punk hit UK's No1 slot
electronic duo Daft Punk have scored their first-ever UK number one single with much-awaited funky comeback track Get Lucky.
After shooting to number three just 48 hours after the single went on sale last week, the Frenchmen's collaboration with Pharrell Williams and Chic guitarist Nile Rodgers got second-time lucky to knock Rudimental's Waiting All Night Ft Ella Eyre off the top.