A test fluid measurement device includes an output acquisition unit for acquiring an output value from a urinary sugar sensor, when a reference fluid, set to a specified density, is applied to the urinary sugar sensor. By using this output value to set a reference value, a reference value setting unit calibrates the sensitivity of the urinary sugar sensor. During sensitivity calibration, an output value judgment unit determines according to an output value that is already acquired by the output acquisition unit whether or not the output value that is newly acquired by the output acquisition unit is suitable to be set as the reference value. After an output value is determined not to be suitable as the reference value setting, a reference fluid detection unit detects when more reference fluid from which another output value is to be acquired by the output acquisition unit has been additionally applied.