The door is considered to be the one on which Masatsura KUSUNOKI carved his death poem 'Since I will never come back alive, I am writing down the names of my fellows and me, who are to be numbered among the dead,' when leaving for the front in the Battle of Shijonawate.
楠木正行が四条畷の戦いに出陣する時に、「かへらじとかねて思へば梓弓なき数に入る名をぞとどむる」と本堂の扉に辞世の歌を刻んだ、その扉とされている。