PROBLEM TO BE SOLVED: To provide a biological sensor having high use durability while flexibly adapting to a shape or movement of a human body, an animal or the like.SOLUTION: A biological sensor 1 includes: a planar first electrode 2 capable of receiving pressure from at least a part of a human body or an animal a planar second electrode 3 facing to the first electrode 2 apart from the first electrode 2 and a planar electric conductor 4 interposed between the first electrode 2 and the second electrode 3. A part of at least one of the front face and the rear face of the electric conductor 4 has an insulation region 5, and each of the first electrode 2, the second electrode 3 and the electric conductor 4 has flexibility.
