Apparatus and Method for measuring physiological signal

In the biological signal measuring apparatus for measuring a bio signal, a battery cover for covering areas that can be detachable battery of the terminal device; Sensor unit for sensing biological signals that are included in the battery cover; The sensor unit and a control unit for controlling to detect the biometric signal, and biological signal measuring apparatus, whereby a detachable battery cover and the terminal apparatus is disclosed a living body signal measuring apparatus, characterized in that the terminal device can be detachable.