Disclosed is a monitoring information screen display device for use in a to-be-observed person monitoring system equipped with a sensor device configured to, when it judges that a to-be-observed person has performed a given action, transmit monitoring information including a result of the judgment. The monitoring information screen display device comprises a communication section, a display section, and a display processing section. The display processing section is configured to generate a monitoring information screen including the judgment result, based on the monitoring information received by the communication section, and cause the display section to display the monitoring information screen thereon. The display processing section is operable, when the communication section receives new monitoring information in a state in which the display processing section causes the display section to display the monitoring information screen thereon, to cause the display section to display thereon another monitoring information screen generated based on the new monitoring information received by the communication section, in place of the monitoring information screen currently displayed on the display section.
