The present disclosure provides a dry electrode for a bio-electromagnetic wave detecting device, its manufacturing method, and a sensor element and a bio-electromagnetic wave detecting device comprising the dry electrode. The dry electrode comprises: a flexible substrate, at least one set of protruding structures arranged on the flexible substrate, electrode lead-out terminals and electrode lead-out wires, wherein the protruding structure comprises an inner core made of a flexible insulating material, and a conductive thin film coated on an outer side of the inner core.
