Victoria Beckham Credits David for Boosting Her Confidence, Saving Brand

I'M SO LUCKY HE BELIEVES IN MEVictoria Beckham sat down with the "Today" show Wednesday, spilling on the ups and downs of her business career ... which put a strain on her marriage with David Beckham.

The singer-turned-fashion-designer said, "There's been times the entire business is falling to pieces. I'm so lucky that [David] does believe in me -- at a time when a lot of people didn't."

David believed in her so much that he put his own money into her brand when she was drowning in millions of dollars of debt ... money David reportedly wasn't sure they could afford losing.

VB says those tough years being a "laughingstock" still leave her with plenty to prove in the fashion world ... even now…