She said she saw no reason to delay the decision, at a joint news conference alongside Sweden's prime minister.
Her comments coincided with a report to the Finnish parliament that said membership of the bloc could result in "increased tensions on the border between Finland and Russia".
Moscow has warned Finland and Sweden against joining Nato in recent weeks.
Finland and Sweden are militarily non-aligned but Russia's invasion of Ukraine has prompted increasing public support to become members of the Western defensive alliance. Swedish leader Magdalena Andersson told reporters that the same "very serious analysis" was taking place as in Finland and she saw no point in delaying it.
Swedish newspaper Svenska Dagbladet reported on Wednesday that Ms Andersson was aiming to apply for membership in time for a Nato summit in late June.
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