In recent surveys, there is only a few percentage points in support for the liberal-conservative Gathering Party, the nationalist True Finns and the Social Democrats.
In Finland, there are around 4.5 million people entitled to vote, of which around 40 percent voted in advance, writes Swedish EPN.
The polling stations are open until 20:00 local time, 19:00 in Sweden. The first election forecasts are expected during the evening.