To provide an active ingredient of a pharmaceutical composition or a food composition for improvement, treatment or prevention of male sexual dysfunction, particularly erectile dysfunction.SOLUTION: The present invention provides a secoiridoid glucoside derivative represented by formula (1) or a pharmacologically acceptable salt thereof, or a hydrolysate thereof (Rand Rindependently represent a C1-4 alkyl group; R-Rindependently represent H, optionally protected two or more hydroxy groups, or a C1-4 alkyl group; m is an integer of 1-3; n is an integer of 1-4).SELECTED DRAWING: None【課題】男性性機能障害、特に勃起機能障害の改善、治療又は予防のための医薬組成物又は食品組成物の有効成分の提供。【解決手段】式(1)で表されるセコイリドイドグルコシド誘導体もしくはその薬理学的に許容される塩又はそれらの加水分解物。(R1及びR2はそれぞれ独立して炭素数1~4のアルキル基;R3~R7はそれぞれ独立してH、保護されていてもよい2つ以上のヒドロキシ基、又は炭素数1~4のアルキル基;mは1~3の整数;nは1~4の整数を表す)【選択図】なし