A measuring apparatus for measuring numerical information in relation to a test substance contained in a sample, the measuring apparatus comprising: a sensor which continuously generates a signal correlated with the numerical information in relation to the test substance contained in the sample; a power generating unit which generates an electric power for driving the sensor; an electricity accumulating unit which is charged by the electric power supplied from the power generating unit and which supplies the accumulated electric power to the sensor; and a power generation control unit which monitors a power generation amount generated by the power generating unit; wherein the power generation control unit is configured to calculate a power generation rate as the power generation amount per unit time in the power generating unit when the power generation amount generated by the power generating unit is monitored; wherein the measuring apparatus further comprises: a storage unit which stores the power generation rate calculated by the power generation control unit, wherein: the power generation control unit is configured to regulate a value of a reference voltage for judgment which is a threshold value to start the monitoring of the power generation amount in the power generating unit depending on an average power generation rate calculated by averaging values of the power generation rates obtained in the past a plurality of times including a value stored most recently, of the power generation rates stored in the storage unit. a sensor which continuously generates a signal correlated with the numerical information in relation to the test substance contained in the sample; a power generating unit which generates an electric power for driving the sensor; an electricity accumulating unit which is charged by the electric power supplied from the power generating unit and which supplies the accumulated electric power to the sensor; and a power generation control unit which monitors a power generation amount generated by the power generating unit; wherein the power generation control unit is configured to calculate a power generation rate as the power generation amount per unit time in the power generating unit when the power generation amount generated by the power generating unit is monitored; wherein the measuring apparatus further comprises: a storage unit which stores the power generation rate calculated by the power generation control unit, wherein: the power generation control unit is configured to regulate a value of a reference voltage for judgment which is a threshold value to start the monitoring of the power generation amount in the power generating unit depending on an average power generation rate calculated by averaging values of the power generation rates obtained in the past a plurality of times including a value stored most recently, of the power generation rates stored in the storage unit. a storage unit which stores the power generation rate calculated by the power generation control unit, wherein: the power generation control unit is configured to regulate a value of a reference voltage for judgment which is a threshold value to start the monitoring of the power generation amount in the power generating unit depending on an average power generation rate calculated by averaging values of the power generation rates obtained in the past a plurality of times including a value stored most recently, of the power generation rates stored in the storage unit. the power generation control unit is configured to regulate a value of a reference voltage for judgment which is a threshold value to start the monitoring of the power generation amount in the power generating unit depending on an average power generation rate calculated by averaging values of the power generation rates obtained in the past a plurality of times including a value stored most recently, of the power generation rates stored in the storage unit.