Haglund will assume his new post after being sworn in at a government plenary session.
Last Friday President Sauli Niinistö released Stefan Wallin from his ministerial responsibilities and appointed Haglund in his place.
Haglund has worked as Member of the European Parliament since 2009. The 33-year-old is the youngest-ever chair of the small Swedish People’s Party, which represents Finland's six-percent Swedish-speaking minority.