To provide a telemeter observation device capable of avoiding inconvenience in which transmission data are temporally overlapped and consequently reducing the rate of occurrence of lack of data considerably in a receiving side in an automatic start type observation device transmitting data acquired from a sensor device a plurality of times when automatically started.

An observation device 10 installed in each observation station 1 performs data transmission of observation data fetched by a rain gauge 3 being an observation device (sensor) three times in total at a communication interval (transmission interval) being different in each station set to a transmission interval setting part (TXIT) 12 when the device 10 each is automatically started.