The most expensive car in the world is the rolls-royce la rose noire droptail. Touted as the costliest car ever made at a staggering rs. Rolls-royce la rose noire droptail serves as the british luxury car maker’s tribute to automobile craftsmanship. Rolls royce sweptail, an one-off model commissioned by hong kong–based customer sam li, son of billionaire real estate mogul samuel tak lee . It one of the world’s most expensive new cars at the time, priced around £10 million (over $13 million).