Google Ventures Bill Maris.
At Fortune's Brainstorm Tech conference in Aspen, Colorado, on Tuesday, he said that he sees the long-term value of the company at "$200 billion or more," according to a report in Bloomberg.
As Bloomberg notes, that's around the same market value as Toyota.
Last week, Uber investor and board member Bill Gurley estimated Uber has a market opportunity of anywhere between $450 billion and $1.35 trillion per year since Uber's service "significantly expands the core market" and could be considered a "car ownership alternative."
Previously, other investors claimed that the taxi alternative could be valued close to $100 billion. So Maris' estimates aren't that far off from what others are saying.
Uber has so far raised $1.5 billion in funding. Google Ventures reinvested this year after it invested more than $250 million in the company last year.
"It's an incredibly creative team - their growth shows they are clearly onto something," Maris told Bloomberg.
But, he warns, it's still a startup, and "it could also go down to zero," Bloomberg reports.