Provided is a physiological information detection sensor capable of implementing miniaturization by substantially securing a creepage distance and an air distance (e.g., implementing defibrillation protection).The physiological information detection sensor includes: a plurality of first substrates arranged in multiple tiers a second substrate a first connecting portion that electrically connects adjacent first substrates to each other among the plurality of first substrates and an insulating member. Each of the plurality of first substrates has a defibrillation protection resistor mounted thereon and electrically connected to a physiological information detection unit. The second substrate has a circuit mounted thereon to process physiological information input from the physiological information detection unit via the defibrillation protection resistor. The insulating member is disposed between adjacent first substrates among the plurality of first substrates.
