PROBLEM TO BE SOLVED: To provide a biological sensor capable of having conductivity while suppressing peeling between an adhesive layer installed on one surface of an electrode and a biological surface on which an electrode is installed. A biological sensor according to the present invention includes a pressure-sensitive adhesive layer for sticking to a biological surface and electrodes arranged so as to be in contact with the biological surface on the sticking side of the pressure-sensitive adhesive layer to the biological surface. An electronic device that processes a biological signal acquired via the electrode, and a circuit unit that connects the electrode and the electronic device, and the electrode is attached to the biological surface on the side of the circuit unit. Has a connecting surface to be connected. [Selection diagram] Fig. 1【課題】電極の一方の面に設置される接着層と電極が設置される生体表面との剥離を抑制しつつ導電性を有することができる生体センサを提供する。【解決手段】本発明に係る生体センサは、生体表面に貼付するための感圧接着層と、前記感圧接着層の生体表面への貼付側に前記生体表面と接触可能に配置される電極と、前記電極を介して取得する生体信号を処理する電子装置と、前記電極及び前記電子装置を接続する回路部と、を有し、前記電極は、前記生体表面への貼付側で前記回路部と接続される接続面を有する。【選択図】図１
