群馬県の中之条町四万温泉の元禄7年に湯治宿として開業された歴史ある旅館であり、映画「千と千尋の神隠し」のモデルという説もある積善館の改修プロジェクトである。本館は現存する中で日本最古の木造温泉宿で群馬県の重要文化財に指定されている。
幾度となる増築が繰り返され現在の形となっており、同敷地内に山の斜面に沿って3棟の宿泊施設がある。つくられた年代の差もあり各々違った雰囲気をもち、価格帯もさまざまである。
「草津の治し湯」とも言われ、美肌の湯として泉質も体に優しい効能で知られてきた。湯治文化の盛んだった時代には多くの人が滞在しながら療養していたという。
今回、現代湯治としての宿泊施設を考えた。働き方の変化の中、どこにいてもテレワークが可能になってきた現代、心と体を休ませながら仕事もできる日常とつながった湯治場として提案できると考えた。
このプロジェクトの第一弾として山荘棟の客室改修を行った。客室は入ってすぐに部屋がありその奥に居間がある日本家屋の一般的な構成である。角部屋のため居間に入ると2方向に自然が広がる。障子を四連引きに替え、大きく開け放てるようにした。この趣のある部屋に何か付け足すのではなく、要素を減らす方法でこの部屋の特徴がより引き立つようにと考えた。木障子上の小壁をガラスへ、アルミサッシは木枠のFIX窓、足元の曇りガラスは透明ガラスへと変換し、より外とのつながりを感じられる浮遊感のある空間となった。部屋の構成については、改修前は行き止まりが多く過ごし方に制限があったため、部屋内部をぐるりと巡れる回遊性のある平面計画とし、さまざまな場面へ適応できるような工夫をした。今では使われず飾りとなっていた書院は本来の意味である書斎として蘇らせることで現代湯治の場をつくり出した。（永山祐子）
Renovated guest rooms of a historic ryokan for a modern hot-spring cure
This was a project to renovate Sekizenkan, a ryokan (Japanese-style inn) founded as a hot spring health resort in 1694 in Shima Onsen, Nakanojo Town, Gunma Prefecture. It is said that Sekizenkan was the model for the film “Sen to Chihiro no Kamikakushi” (“Spirited Away”). The main building are the oldest existing timber hot spring buildings in Japan and have been designated by Gunma Prefecture as important cultural assets. The present form has been achieved as a result of many extensions, and within the site there are three accommodation buildings along the slope of the mountain. They were each constructed at different times and have different atmospheres, as well as price ranges. It is also referred to as “Kusatsu no Naoshi Yu” (“healing waters of Kusatsu”), and the water is known for its gentle effect on the body and for beautiful skin. It is said that many people have been cured while staying here in the heyday of hot spring cures.
In this project, the concept was an accommodation facility for modern hot spring cure. With changing work patterns, the idea was to propose a health resort where it is possible to connect with everyday life including work while resting both mind and body, for this age when tele-working is possible everywhere. The first stage of the project was renovation of the guest rooms of the Sanso building. The guest rooms have the typical composition of a Japanese house, in which there is a room immediately upon entering, and the living room is further in-side. Inside the living room nature extends in two directions, as they are corner rooms. By pull-ing the sliding screens to one side and opening the corners, the panorama of the corner room can be obtained. It was considered that the grace of the rooms is enhanced by reducing elements to bring out the characteristics of the room, and not by adding elements. A floating space with a greater feeling of connection to the outside is produced by replacing the small walls above the timber sliding doors with glass, replacing aluminum sashes with timber fixed windows, and opaque glass at the bottom with clear glass. Before renovation, the composition of most of the rooms had a dead-end which restricted how the room was used. Therefore a plan composition was adopted within the rooms that allowed wandering around in a loop, so the rooms can be adapted to various situations.The studys (“shoin”) which were previously ornamented have been revived in the original meaning of “shosai”, so we have produced a modern hot spring health resort. (Yuko Nagayama)
【積善館 山荘】
所在地：群馬県吾妻郡中之条町四万温泉
用途：旅館
クライアント：マネジメント・シェルパ・クリエイト
竣工：2019年
設計：永山祐子建築設計
担当：永山祐子、井出美咲
構造設計：森部康司
施工：町田工業
照明・アート：小林正樹
照明：TAiGALamp
植栽：和想
撮影：Nobutada Omote
工事種別：リノベーション
構造：木造
計画面積：70.00m²
設計期間：2018.03-2019.05
施工期間：2018.03-2019.05
【Sekizenkan Sanso】
Location: Shima Onsen, Nakanojo-machi, Agatsuma-gun, Gunma, Japan
Principal use: Hotel
Client: Management Sherpa Create
Completion: 2019
Architects: YUKO NAGAYAMA & ASSOCIATES
Design team: Yuko Nagayama, Misaki Ide
Structure engineer: Yasushi Moribe
Contractor: Machida Kogyo
Light / Art: Masaki Kobayashi
Lighting Production: TAiGALamp
Planting Design: WA-SO
Photographs: Nobutada Omote
Construction type: Renovation
Main structure: Wood
Planning area: 70.00m²
Design term: 2018.03-2019.05
Construction term: 2018.03-2019.05
