This mark stone is standing at the front of the left side of the main building of Senso-ji Temple. It is carved "Namu Daijihi Kanzeon-bosatsu Mayoiko-no Shirube" and had been used for exchanging information about lost child in the Edo period.

It is carved "Shirasuru-kata (to let know)" on the right side of the stone, and people put the paper here, to give the information about a lost child or a missing person whom they were keeping.

On the left side, "Tazunuru-kata (to ask)" is carved, and people put the paper here, to give information about one who they are looking for. In the Edo period, people looked for a lost child or a missing person checking these papers.

This mark stone was raised on March, 1860 by MATSUDAYA Kahei, who was an owner of geisha house in Shin Yoshiwara, in order to mourn for the dead in the red-light district in the Ansei Great Earthquakes happened at about ten o'clock at night on October 2, 1855. The dead and wounded by that earthquakes estimated at magnitude 6.9 and accompanied fires are said to reach 1000 people in Yoshiwara area.

It was originally located in front of Nio-mon Gate (current Hozo-mon Gate), but collapsed in the World War II and a part of the foundation stone barely remained. The present mark stone was restored in 1957.

In Tokyo, a same mark stone for lost child remains at the foot of Ichikoku-bashi Bridge over Nihonbashi-gawa River. In the collection of short stories "Genshoku Edo Goyomi" by MIYABE Miyuki, you can find a mark stone for lost child (not one in Asakusa) in the story "Maigo no Shirabe".