Akira Takarada as Hideto Ogata

Momoko Kôchi as Emiko Yamane

Akihiko Hirata as Daisuke Serizawa

Takashi Shimura as Kyohei Yamane

Fuyuki Murakami as Professor Tanabe

Sachio Sakai as Newspaper Reporter Hagiwara

Ren Yamamoto as Masaji Yamada

Toyoaki Suzuki as Shinkichi Yamada

Toranosuke Ogawa as President of Company

Hiroshi Hayashi as Chairman of Diet Committee

Seijirô Onda as Parliamentarian Oyama

Kin Sugai as Ozawa-san

Haruo Nakajima as Godzilla

Tsuruko Mano as Mrs. Yamada

Kokuten Kōdō as The Old Fisherman (uncredited)

Tadashi Okabe as Prof. Tababe's Assistant (uncredited)

Jirô Mitsuaki as Employee of Nankai Salvage Company (uncredited)

Ren Imaizumi as Radio Operator (uncredited)

Sôkichi Maki as Chief of Maritime Safety Agency (uncredited)

Kenji Sahara as Young Lover on Ship (uncredited)

Yasuhisa Tsutsumi as Soldier (uncredited)

Takeo Oikawa as Chief of Emergency Headquarters (uncredited)

Junpei Natsuki as Power Station Engineer (uncredited)

Katsumi Tezuka as Godzilla

Saburô Iketani as News Reporter (uncredited)

Shizuko Azuma as Woman with Children (uncredited)

Shizuko Higashi as Partygoer (uncredited)

Kiyoshi Kamata as Partygoer's Escort (uncredited)

Keiji Sakakida as Mayor Inada (uncredited)

Tamae Sengo as Mother (uncredited)