A biological sample measurement device comprising a main body case including a sensor mounting component; a measurement component including an input side; a controller connected to the measurement component, the controller including a measurement preparation mode and a measurement mode, the controller configured to determine whether there is an abnormality in the measurement component; a memory component connected to the controller; a switching component connected to the input side of the measurement component, a first reference resistor, and to the sensor mounting component; the switching component configured to switch between at least two states.