The limousine used to carry the imperial couple in Emperor Naruhito's enthronement procession on November 10 is on display in Tokyo.
The open-top vehicle is based on Toyota Motor's Century sedan. It cost the government about 730-thousand dollars.
The exhibit started on Thursday at the Front Garden of the State Guest House. The car is covered by a transparent acrylic box.
Its license plates read "1110," the date of the parade.
On Thursday, many visitors took pictures in front of the memorial car.
A woman in her 50s from Mie Prefecture, central Japan, said she was moved to see the limousine used in the parade she saw on TV.
A woman in her 40s from Hokkaido in northern Japan said she hopes the special car will be used on various occasions.
The display is to continue until January 5, with some days off. The car is then to be moved to the Kyoto State Guest House for another public display from January 9 to March 17.