A magnetic detection type switch in which a single magnetic field generation unit is disposed in a movable portion and two magnetic detection units are disposed in a fixed portion ; wherein each magnetic detection unit has two first magnetoresistance effect elements and two second magnetoresistance effect elements that have a structure in which a fixed magnetic layer and a free magnetic layer having a magnetization directing in a direction of an external magnetic field are laminated via a non-magnetic layer, and a first sensitivity axis direction (PX2) of the first magnetoresistance effect elements and a second sensitivity axis direction (PY2) of the second magnetoresistance effect elements are orthogonal to each other; wherein each magnetic detection unit comprises a first bridge circuit and a second bridge circuit , respectively, each first bridge circuit comprising a first leg and a second leg connected in parallel with each other, each of the first and second legs comprising one of the first magnetoresistance effect elements and a fixed resistance element serially connected with each other at a midpoint of the respective leg, wherein the order of the first magnetoresistance effect element and the fixed resistance element in the second leg is reversed with respect to the first leg; and each second bridge circuit comprising a third leg and a fourth leg connected in parallel with each other, each of the third and fourth legs comprising one of the second magnetoresistance effect elements and a fixed resistance element serially connected with each other at a midpoint of the respective leg, wherein the order of the second magnetoresistance effect element and the fixed resistance element in the fourth leg is reversed with respect to the third leg; wherein the two midpoints of the legs of the first bridge circuit are connected to a first differential amplifier , the output of which is connected to a first Schmitt trigger circuit which is configured for outputting a first ON or OFF detection output (1-S1, 2-S1); and wherein the two midpoints of the legs of the second bridge circuit are connected to a second differential amplifier , the output of which is connected to a second Schmitt trigger circuit which is configured for outputting a second ON or OFF detection output (1-S2, 2-S2); wherein the movable portion is supported to be movable between six positions ( to ) that are divided by two parallel first virtual lines (A) extending parallel to the first sensitivity axis direction (PX2) and a second virtual line (B) which is orthogonal to the first virtual lines (A) in a plane, wherein the first virtual lines (A) are disposed with a gap in the direction of the second virtual line (B) so that an inner portion of the plane is divided into the positions ( to ), the number of which is six; wherein the magnetic detection units are fixedly supported at the crossing positions (C) of the first virtual lines (A) with the second virtual line (B), wherein the movable portion is supported to be movable between five or more of the positions among the six positions ( to ), and wherein the five or more of the positions ( to ) are detectable based on the first detection outputs (1-S1, 2-S1), which are obtained from the first bridge circuits comprising the first magnetoresistance effect elements , and the second detection outputs (1-S2, 2-S2), which are obtained from the second bridge circuits comprising the second magnetoresistance effect elements , in each of the magnetic detection units ; and wherein, when any of the first detection outputs (1-S1, 2-S1) is out of order, five or more of the six positions ( to ) are detectable by activating a system , which is comprised in the magnetic detection type switch and which is configured for combining the three remaining detection outputs (1-S1, 1-S2, 2-S2 or 2-S1, 1-S2, 2-S2). <EOS>