Atop the sammon gate lie the two plain wood coffins with wooden statues carved by master carpenter Kinuemon GOMI and his wife who it is said poured all of their energies into the construction of the gate at the order of the Shogun and, after its completion, took responsibility for the work exceeding the budget by taking their own lives.
三門楼上に安置されている二つの白木の棺で、中には将軍家より三門造営の命を請け、三門完成後に工事の予算が超過したため責任をとって自刃したと伝えられている大工の棟梁・五味金右衛門夫婦の自作の木像が納められている。