Abstract: There is provided a determination device comprising a determination section configured to determine an area where a portable device is positioned, on a basis of wireless communication between a plurality of first wireless communication devices disposed at different portions in a target space where a plurality of areas is defined and a second wireless communication device installed in a portable device, in conformity with a designated communication standard, wherein the determination section determines the area where the portable device is positioned, by using different determination expressions depending on the respective first wireless communication devices, each of which has successfully calculated an RSSI with regard to a signal received from the second wireless communication device through wireless communication compliant with the designated communication standard and a determination target area.

Abstract: There is provided a determination device comprising a determination section configured to determine an area where a portable device is positioned, on a basis of wireless communication between a plurality of first wireless communication devices installed at different portions of a mobile object and a second wireless communication device installed in a portable device, in conformity with a designated communication standard, wherein the determination section determines the area where the portable device is positioned, by using different determination expressions depending on the respective first wireless communication devices, each of which has successfully calculated an RSSI with regard to a signal received from the second wireless communication device through wireless communication compliant with the designated communication standard and a determination target area.