LONDON — Amazon is taking a big step into the international restaurant delivery business — and taking a shot at one of Uber’s most promising markets in the process.

The e-commerce giant said on Friday that it would lead a $575 million investment in Deliveroo, becoming one of the London-based start-up’s biggest backers.

The cash infusion will strengthen one of the largest international rivals to Uber’s meal-delivery division, UberEats, which the ride-hailing company has identified as one of its most promising businesses.

Including the new investment round, which also involved existing backers like T. Rowe Price and Fidelity, Deliveroo has now raised $1.53 billion.