In the minutes before the parade began, police at the Hibiya crossing in central Tokyo warned would-be attendees that the area was full.
Akihito's abdication this year brought Naruhito to the throne and marked the start of the Reiwa era.
The royal couple emerged from the palace moments before 3.00pm (0600 GMT), with the emperor wearing formal western clothing and the empress dressed in a long cream gown and jacket, wearing a tiara passed down by her predecessor.
"We're at Disneyland levels of crowding".
Yoko Mori, 64, lined up from 10:00 am to snag a spot to see the parade, travelling from Saitama outside Tokyo.
"We came here because it's a once in a lifetime opportunity and we wanted to celebrate this event", she told AFP, flanked by her friend Chiyoe Ito, 70. "I concentrated so much on taking a photo, I barely looked with my own eyes".
Hours before the parade, Yukari Oshita said she felt a closeness to Naruhito, the first emperor born in post-war Japan.
The parade was originally due to take place on October 22, when the emperor officially proclaimed his enthronement before dignitaries from about 190 countries, but it was postponed as Japan grappled with the aftermath of a devastating typhoon.
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"And Empress Masako is someone who can be a role model for modern women with full-time jobs".
Under a cloudless blue sky, Emperor Naruhito and Empress Masako, Harvard-educated former diplomat, waved from an open-top Toyota Century limousine, which cruised through streets lined with spectators and police.
She has struggled to adjust to cloistered royal life, suffering an adjustment disorder that led to a scaling back of her public appearances.
The sunny streets of Tokyo are already filling up with excited crowds ahead of Emperor Naruhito's enthronement procession.
She won plaudits for her assured performance when the USA president, Donald Trump, became the first foreign leader to meet the new emperor, winning praise in particular for her ability to converse in fluent English. It was a stark contrast from last month's enthronement ceremony, in which both wore traditional robes.
About 16.1 billion yen ($147 million) has been earmarked for succession-related ceremonies throughout the year, including Sunday's parade, up 30% from Akihito's succession three decades ago.
Tens of thousands of people gathered on Saturday at a national festival to celebrate the enthronement of Japan's Emperor Naruhito with dancers and pop stars offering jubilant performances.
Subban and Frederik Andersen stood tall through the first 40 minutes of the game as neither allowed a goal in two periods of play. Max Pacioretty: Pacioretty opened the scoring in the third period and gave Vegas the lead early in the final frame.
Customers can expect to find a huge range of discounts and bargains as all stock must go before the Romford store closure. While Mothercare's worldwide shops remain profitable, its United Kingdom division faced serious financial difficulties.
Weber was the centre of attention on this night, not because he scored twice, but because of the way he scored his first goal. Nate Thompson also scored and Carey Price made 31 saves. "We had a good second, we had a good third", Kopitar said.
Given the stakes, the stage and the production, this was arguably the best game Najee Harris has had in an Alabama uniform. Tagovailoa limped off the field after the game, his first since suffering an ankle injury against Tennessee on October 20.
Exactly six months after their first baby, Prince Harry may have just hinted that the couple are preparing for their second child. Each royal accessorized with a red poppy pin - an artificial flower that has been used to honor fallen veterans since 1921.
In the recent episode of Weekend Ka Vaar, Salman lashed out at Mahira Sharma after her showdown with Sidharth in BB factory task. Fans of the reality show took a dig on Salman by writing '#BiasedHostSalmanKhan'. "Trending since last night till now".
She finished with 15 winners and eight aces. "I love these sort of matches, the bigger the pressure, the more special the event". The Australian finally held serve on her seventh attempt, but it only slightly delayed Mladenovic's inevitable victory.
Le service fonctionnera à partir du 31 décembre de cette année aux Etats-Unis, puis sera étendu au monde entier courant 2020. L'entreprise s'est souvent vu reprocher de ne pas faire assez d'efforts pour satisfaire aux plaintes de ses clients.
Meanwhile, United now prefer to play on the counter-attack, with their best games coming when they didn't have much of the ball. United were able to beat over Partizan during the week, but it may have cost them two key players in the process.
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Central New York Weekend Weather Forecast
A low of 11 degrees was reported in Walpack, Sussex County, while several towns reported temperatures in the low-to-mid teens. Sunday: Colder by afternoon, a 90 percent chance of snow with 2 inches accumulation, and an early afternoon high of 28.
Heat on lockdown regarding Dion Waiters' health situation
Waiters has yet to suit up for the Heat this season and was for the opening night game for " conduct detrimental to the team ". Heat officials told NBC Sports after the game they would not comment on Waiters, his health or status with the team.