Annaka Samurai Nagaya House is one of very few remaining original Samurai House that takes Nagaya style building. Nagaya is a large long apartment. Several numbers of Samurai families shared the house. Each residential spaces are divided, and each rooms has kitchens and Doma. They share well and restroom.

Samurai Nagaya House of Annaka has 4 residential spaces. 3 spaces remains in original and reconstructed another one to recover to the original building.

It is 47.32m wide and 5.46m deep. Each residential space has 2 rooms, kitchen and doma. This building was shared with low rank Samurai.