A biological signal measurement system includes: a biological signal measurer that measures a biological signal including external noise of biological noise and of environmental noise； biological noise measurer that measures a signal including the biological noise； a biological noise estimator that estimates the biological noise from the signal measured by the biological noise measurer； an environmental noise measurer that measures a signal including the environmental noise； an environmental noise estimator that estimates the environmental noise from the signal measured by the environmental noise measurer； and a calculator that calculates the biological signal in consideration of an effect of the external noise using the signal measured by the biological signal measurer, the biological noise estimated by the biological noise estimator and the environmental noise estimated by the environmental noise estimator.
