The Prince ended up slithering over the finish line on his head.
The 43-year-old driver, racing under his family name of Grimaldi, came out of a bend too high and his sled was thrust over on its side.
It eventually came to a halt in the finish area where the crew scrambled out unhurt in front of a cheering crowd.
The mishap happened during the third heat of the four-run competition.
His team eventually finished 28th in the competition, some 9.68 seconds behind winners Germany II.