PURPOSE: To easily grasp variations in measurement values with respect to a reference value during a certain period of time, by supplying to a date indicator daily measurement data menorized in memories the number of which is in agreement with that of dates in the data indicator.

CONSTITUTION: This comparison value indicator is provided with a means 2 for indicating time digitally, a means 16 for decoding date data from the means 2 to indicate dates, a means 9 for memorizing an arbitrary reference value, data detection means 8 for measuring a body temperature, blood pressure and body-weight, and a circuit for comparing a reference signal from the means 9 with data signal from the means 8. One of the memories 7, the number of which is in agreement with that of dates in the date indicator, is set in a writable condition with date data, and a comparison result signal from the circuit 10 is written in the memory. Read- out information from the memory is then supplied to the means 16. As a result, variations in measurement results during a certain period of time can be grasped at a glance.