The kaiju Midoron from episode #3 of Spectreman.

スペクトルマン Spectreman by Yoshio Watanabe

Trivia: Supekutoruman was the first major Japanese superhero show of the 70s, as it began airing three months before Tsuburaya Productions's The Return of Ultraman and Toei and Ishimori Productions' Kamen Rider. Produced by P Productions and created by Souji Ushio, the series aired on Fuji TV from January 1971 to March 1972.