Former Nishikawa Residence, Traditional merchant house in Ōmihachiman, Japan.

The Nishikawa Residence is an 18th-century timber building with tatami mats, sliding doors, and an open hearth at its center. The rooms are arranged around a central area, displaying the typical layout of a wealthy merchant house from that era.

The house was built in 1706 during the Edo period, when the Nishikawa family prospered through trade in mosquito nets and tatami mat trim. This era shaped the building's style and layout as a reflection of commercial success.

The house reveals how prosperous merchants lived and conducted business in this region. The rooms with their sliding doors and hearth fire show the daily routines and habits of the family.

The house is closed on Mondays and the day after a public holiday; it opens instead on a Monday that falls on a holiday. Opening hours run from 9:00 to 16:30, with last entry at 16:00. The building faces Shinmachi-dori, and there are five parking spaces for ordinary cars. From Omihachiman Station, take an Omi Railway bus to the Obatacho Shiryokan-mae stop, then walk two minutes.

The storehouse in the garden has three floors, unusual for an early modern building of its kind. In August 2014, the plaster wall of this storehouse peeled off under the influence of Typhoon No. 11. The main house was built in 1706 by the third generation of the family.