noun
editorial page
Refers specifically to the page in a newspaper where editorials (社説) appear.
今朝の社説面には、教育改革についての意見が載っていた。
This morning's editorial page carried an opinion on education reform.
一面 is the front page; 社説面 is a specific inside page for editorials.
Compound of 社説 (editorial) + 面 (page, surface).