Some 75 percent of respondents to a survey commissioned by the Prime Minister's Office said that Finland's Nato membership has strengthened their sense of security.
That sense was particularly evident among people in older age groups, the survey found, with men somewhat more likely than women to say that Nato membership had improved the country's security situation.
The data also revealed that just five percent of respondents reported feeling their own sense of security had weakened since Finland's membership in the alliance was confirmed at the beginning of April.
Overall, four-out-of-five said they trust Nato either 'quite strongly' or 'very strongly', while two-thirds of respondents reported strong or very strong confidence in the European Union.
This latest survey was the 45th Citizen's Pulse survey to be carried out by the Prime Minister's Office, but the first to enquire about confidence in Nato and the EU.
The polling of attitudes was carried out by Statistics Finland between 26 April and 2 May.
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