The present invention provides: an electrode sheet capable of suppressing an influence of noise that is applied on a wire； and a biological signal measuring device that uses the electrode sheet capable of suppressing an influence of noise that is applied on the wire. The electrode sheet is provided with: a sheet (11)； a biological signal receiving electrode (12) that is formed at the sheet (11) and that is exposed from the sheet (11)； a biological signal amplifier (13) that is formed at the sheet (11)； an interface part (14) that is for connection to an external biological signal processing unit (20)； a first wire (15) that connects the biological signal receiving electrode (12) and an input part (13A) of the biological signal amplifier (13) to each other； and a second wire (16) that connects the interface part (14) and an output part (13B) of the biological signal amplifier (13) to each other. The biological signal measuring device uses the electrode sheet.
