The menu was bought at an auction in 2012 by owner of Spareroom.com Rupert Hunt, who said he bought it as a 'company investment.'
He added: "My friends and family thought I was crazy.
"I have had a strong interest in the Titanic story ... and having looked at various means of investment, I thought, why not invest in something that I have a passion for. I also have a passion for food too, so this amazing artifact really caught my imagination.
"I'm sure visitors to Titanic Belfast will enjoy it as much as I have; it really is a fascinating piece of the Titanic story."
The valuable menu, dated 14 April, 1912, would have be the last luncheon served on board R.M.S Titanic which sank after colliding with an iceberg in the Atlantic Ocean in the early hours of 15 April, 1912.
The artefact featured 40 options, including grilled mutton chops, gorgonzola cheese and corned ox tongue.
I have had a strong interest in the Titanic story since first watching the film 'Raise The Titanic.'
It is believed fewer first class Titanic luncheon menus exist compared to evening menus.
This is largely due to the number of passengers who had kept them in coats which were given to shelter women and children as the ship was sinking.
The menu survived the disaster, which claimed the lives of more than 1,500 people, in a purse belonging to passenger Ruth Dodge, the wife of Dr Washington Dodge.
On its reverse, a hand-written note from a ship steward, who knew the family, reads, 'With compliments & best wishes from Frederic Dent Ray, 56 Palmer Park, Reading, Berks'.
Judith Owens, Titanic Belfast's Deputy CEO, said: "The first class luncheon menu is a wonderful addition to the Titanic Belfast exhibition.
"It gives us a great insight and feel for the Edwardian-style grandeur experienced in the fine dining surrounds of the first-class suites on RMS Titanic."