TOKYO (AP) _ The municipal assembly of Hiroshima, the first city to suffer an atomic bombing, unanimously adopted a proclamation today declaring itself a ''nuclear-free'' city and calling for the abolition of nuclear weapons.

The declaration said: ''The abolition of nuclear arms allows no delay. It is the most important and imminent issue concerned with life or death for humankind.''

City official Susumu Yamane said the declaration was passed unanimously by 64 assemblymen. It also said Hiroshima will abide by the three principles of not producing nuclear weapons, possessing them or introducing them into Japan. An estimated 130,000 people, including 110,000 civilians, were killed in Hiroshima on Aug. 6, 1945, when the United States dropped a bomb on the city in the closing days of World War II, according to city figures.

Hiroshima is the 115th city and the 439th municipality in Japan to declare itself nuclear-free, according to the non-profit National Association of Chairmen of City Assemblies.