About 10 fire engines and other vehicles were dispatched, and the fire was extinguished after about 50 minutes.
According to the police, an 82-year-old husband, a 73-year-old wife, and a 47-year-old eldest daughter live in the house at the origin of the fire, and they have not been able to contact them since the fire.
In addition, according to the eldest daughter, who was out of the house at the time of the fire, both the couple needed nursing care, and the 73-year-old wife was already bedridden.
Police believe that the couple may have died, and are investigating the cause of the fire as well as confirming their identity.
The site is an area lined with houses, about 2 kilometers away from JR Izumi-Fuchu Station.