The building, in Leicester Forest East, contains four meeting rooms , offices and an equipment department, and replaces the former Blaby-based headquarters.
Opening the new HQ, Lord Lieutenant of Leicestershire, Jennifer, Lady Gretton, said: “I am delighted to be able to join you on this very special evening and to have this opportunity to open officially your new scouting headquarters.
“I’m a great supporter of the scouting movement, which is an excellent organisation, providing young people with great opportunities and experiences that will stay with them for the rest of their lives.
“It is so encouraging to hear how Leicestershire scouts are attracting an ever-growing number of young people and adults.
“In recent years your membership has increased significantly and new groups have opened across the city and county.
“The acquisition of this new building marks the start of a new era for scouting in Leicestershire, providing a new fit-for-purpose headquarters for a forward-looking movement.
“I would like to congratulate everyone who has worked so hard to ensure this new headquarters has become a reality, this is your legacy and you should be very proud.”
Leicestershire has 119 scout groups, supporting 425 sections in 10 districts, a membership of 7,217, aged five to 25, and 1,662 adult volunteers.