Soto-Sakuradamon Gate of the Former Edo Castle

The Widest Gate Edo Castle Still Has

Soto-Sakuradamon Gate (外桜田門, also written Soto-Sakurada-mon and known to almost everyone simply as Sakuradamon) stands at the southwestern edge of the Kokyo Gaien in Chiyoda Ward, Tokyo, a masugata gate dated by the national register to around 1663 (Kanbun 3) and designated an Important Cultural Property on 7 June 1961.

Two structures make up the designation. The koraimon, roofed in hongawara tiles, faces the bridge over the moat. Behind it, set at right angles, stands the yaguramon, a gatehouse with a side door carrying a long upper storey above the passage. Between them lies the walled square that gives this type of gate its name, and at Sakuradamon that square is the largest of any surviving gate at Edo Castle. The information board on site puts it at roughly 320 tsubo, in the region of 1,060 square metres. The scale was deliberate: this was the southern approach to the Nishinomaru enclosure, and the defences were sized accordingly.

The masugata here projects outward beyond the line of the ramparts, a sotomasugata, which is why the courtyard feels less like a trap and more like a parade ground. Compare it with Tayasumon at the north end of the castle, where the same two-gate principle is folded inside the wall line and the space closes tight around you.

Names are worth untangling. Edo Castle had two Sakurada gates, and this is the outer one. The inner, Uchi-Sakuradamon, is the gate now generally called Kikyomon. The district here is said to have been known as Sakurada-go, which is where the name is thought to come from. Earlier still the gate is said to have been called Odawara-guchi, the mouth of the road running south toward Odawara. In modern Tokyo the word has drifted again: because the National Police Agency and the Metropolitan Police Department headquarters sit across the intersection, Japanese journalists use "Sakurada-mon" as shorthand for the police, in the way "Scotland Yard" works in English.

Rebuilt, Reinforced, Repaired

A visitor looking for pure seventeenth-century carpentry will not find it here, and the reason is more interesting than the disappointment.

The Agency for Cultural Affairs records the gate as dating to around 1663 (Kanbun 3), a reading supported by an inscription reported on the door fittings. Research carried out for the Ministry of the Environment, which owns the gate, describes a longer sequence: original construction estimated to the Kan'ei era (1624 to 1644), destruction in the Meiwa fire of 1772 (Meiwa 9), and rebuilding completed at some point before 1774 (An'ei 3). The two accounts do not sit comfortably together, and anyone citing a construction year should note which source they are following.

What is documented without ambiguity is what happened after 1923. The Great Kanto Earthquake brought down sections of the exterior walls and roof ridges, and in 1926 (Taisho 15) the Imperial Household Ministry took both structures apart and rebuilt them. The outward appearance was kept close to the original, but almost everything behind it changed. Joints were reinforced with bolts and metal fittings. The old earthen walls were replaced with wire-mesh mortar. Under the yaguramon, the stone base was rebuilt in concrete, the traditional wagoya roof frame gave way to a Western king-post truss, and a bridge truss was thrown across the gap between the stone walls to carry the upper storey over the passage. It is an unusually frank piece of early twentieth-century engineering wearing an Edo-period face.

Designation followed in 1961, and small repairs continued for decades. Then, between September 2012 and June 2013, the Ministry of the Environment carried out a full conservation project. The koraimon had suffered decay and insect damage in its structural timbers, and the 2011 Great East Japan Earthquake had loosened roof tiles, so the gate was partly dismantled, its members repaired individually and reassembled. Rotted feet of the bracing posts were cut out and spliced to new timber using a kanawa-tsugi joint, a technique known as netsugi. To reach the base of posts that were not taken down, the whole gate was shifted sideways and jacked up about a metre.

Both roofs were completely re-tiled. Every tile was sorted for cracks and chips, and among them the conservators found Edo-period tiles still in sound condition. Rather than retire them, they laid those tiles together on the south face, where sunlight and drainage give them the best chance of lasting. The policy for the whole project was restraint: respect what the Taisho repair did, add only the minimum reinforcement, change nothing that did not need changing.

Standing at the Sakurada Gate

On the morning of the third day of the third month of Ansei 7, a date later redesignated Man'en 1 and falling on 24 March 1860 in the Western calendar, snow was falling in Edo. Outside this gate, a group of ronin, most of them former Mito retainers, attacked the procession of Ii Naosuke, the tairo who had signed the commercial treaty with the United States and had driven the Ansei purges. He was killed within sight of the walls. The Sakuradamon Incident is one of the events that historians treat as the beginning of the end for the Tokugawa order, and it happened on the ground now crossed by pedestrians and joggers on the Imperial Palace running route.

Nothing on the gate commemorates it, which is worth knowing before you arrive so that you are not searching for a monument that is not there.

What to look at instead. Come from the south side, across the bridge with Sakurada moat on the left and Gaisen moat on the right, and take the koraimon first. Check the roof of the yaguramon on the southern slope, where the older tiles were gathered in 2013. The plaster is worth a second look too: it is shikkui laid over a mortar base, the compromise the Taisho engineers reached and the 2013 work chose to keep, with the eaves soffits finished in white paint over mortar.

Come back after dark if you can. The Kokyo Gaien lighting scheme runs year round, switching on fifteen minutes after sunset and off at nine in the evening, and Sakuradamon is one of the elements it picks out. The colour changes with the season, a soft white in spring and summer, a warmer incandescent tone in autumn and winter. Against the lit office towers behind it, the effect is deliberately understated.

Passage through the gate is free and unrestricted, with no ticket and no closing time, and the upper storey is not open. Photography for personal use requires no permission, though the Ministry of the Environment asks visitors not to bring tripods or reflectors into crowded periods such as the cherry season. Paid professional shoots and monetised live streaming need to go through the media application process instead. Sakuradamon Station on the Tokyo Metro Yurakucho line comes out at the intersection; Kasumigaseki and Hibiya are both walkable, and the Kusunoki Masashige statue and Nijubashi are ten to fifteen minutes away along the gravel of the palace plaza.