Vanhanen will hold talks with his host, Croatian Prime Minister Ivo Sanader, about European issues such as Finaland's coming presidency of the European Union and negotiations on Croatia's membership of the bloc, bilateral relations and key international issues.
The Finish prime minister will also be received by Croatian President Stjepan Mesic and Parliament Speaker Vladimir Seks.
Before Croatia, Vanhanen will visit Turkey on 16 and 17 May.