| As goshin-ei portraits were themselves granted as Imperial gifts from the Taisho period to the Showa period, it is estimated that Hoan-den came into existence in those periods (construction of Hoan-den in the elementary schools became active in around 1935). |
御真影自体は大正～昭和期にかけて下賜されたため、奉安殿の成立もその時期と推測される（小学校の奉安殿建築は昭和10年前後に活発化）。 |