Finland's flamboyant pro-EU Finance Minister Alexander Stubb, whose extrovert style failed to reverse the slumping popularity of his party, has been ousted as its leader.

Interior Minister Petteri Orpo became the new leader with 441 out of 804 votes at Saturday's conservative National Coalition Party congress. Stubb, head of the group since 2014, got 361 votes.

Stubb, a former prime minister, faced criticism for failing to lift the profile of a party that once was Finland's largest. In last year's elections, it finished third.

A leading daily rated the more low-key Orpo as the most capable minister in the center-right, three-party governing coalition.

He is expected to become finance minister after Stubb, a polyglot who seemingly was at ease abroad whose Twitter account has over 250,000 followers.