In a vote that displayed a widespread anxiety about Islam and undermined the country’s reputation for religious tolerance, the Swiss on Sunday overwhelmingly imposed a national ban on the construction of minarets, the prayer towers of mosques, in a referendum drawn up by the far right and opposed by the government. The referendum, which passed with a clear majority of 57.5 percent of the voters and in 22 of Switzerland’s 25 cantons, was a victory for the right.

The vote against was 42.5 percent. Because the ban gained a majority of votes and passed in a majority of the cantons, it will be added to the Constitution. The Swiss Constitution guarantees freedom of religion, but the rightist Swiss People’s Party, or S.V.P., and a small religious party had proposed inserting a single sentence banning the construction of minarets, leading to the referendum.

The Swiss government said it would respect the vote and sought to reassure the Muslim population — mostly immigrants from other parts of Europe, like Kosovo and Turkey — that the minaret ban was “not a rejection of the Muslim community, religion or culture.”

Eveline Widmer-Schlumpf, the justice minister, said the result “reflects fears among the population of Islamic fundamentalist tendencies.” While such concerns “have to be taken seriously,” she said in a statement, “The Federal Council takes the view that a ban on the construction of new minarets is not a feasible means of countering extremist tendencies.”

The government must now draft a supporting law on the ban, a process that could take at least a year and could put Switzerland in breach of international conventions on human rights.

Of 150 mosques or prayer rooms in Switzerland, only 4 have minarets, and only 2 more minarets are planned. None conduct the call to prayer. There are about 400,000 Muslims in a population of some 7.5 million people. Close to 90 percent of Muslims in Switzerland are from Kosovo and Turkey, and most do not adhere to the codes of dress and conduct associated with conservative Muslim countries like Saudi Arabia, said Manon Schick, a spokeswoman for Amnesty International in Switzerland.

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