A magnetic detection device comprising a bridge circuit, the bridge circuit comprising: a first series circuit comprising a first detecting unit, a first resistive unit, and a second detecting unit which are connected in series, the first detecting unit and the second detecting unit comprising a plurality of magnetic detection elements (R11, R12, R13, R14, R15, R16) which are connected in series, respectively, wherein a terminal of the first detecting unit is connected to an input terminal (Vdd) to which a power supply voltage is applied and a terminal of the second detecting unit is connected to a ground terminal; and a second series circuit comprising a third detecting unit, a second resistive unit, and a fourth detecting unit which are connected in series, the third detecting unit and the fourth detecting unit comprising a plurality of magnetic detection elements (R17, R18, R19, R20, R21, R22) which are connected in series, respectively, wherein a terminal of the third detecting unit is connected to the input terminal (Vdd) and a terminal of the fourth detecting unit is connected to the ground terminal, wherein a first output portion is provided at an intermediate point between the first detecting unit and the first resistive unit, and a second output portion is provided at an intermediate point between the first resistive unit and the second detecting unit, wherein a third output portion is provided at an intermediate point between the third detecting unit and the second resistive unit, and a fourth output portion is provided at an intermediate portion between the second resistive unit and the fourth detecting unit, and wherein the first output portion and the fourth output portion are connected to a first comparator, and the second output portion and the third output portion are connected to a second comparator. a first series circuit comprising a first detecting unit, a first resistive unit, and a second detecting unit which are connected in series, the first detecting unit and the second detecting unit comprising a plurality of magnetic detection elements (R11, R12, R13, R14, R15, R16) which are connected in series, respectively, wherein a terminal of the first detecting unit is connected to an input terminal (Vdd) to which a power supply voltage is applied and a terminal of the second detecting unit is connected to a ground terminal; and a second series circuit comprising a third detecting unit, a second resistive unit, and a fourth detecting unit which are connected in series, the third detecting unit and the fourth detecting unit comprising a plurality of magnetic detection elements (R17, R18, R19, R20, R21, R22) which are connected in series, respectively, wherein a terminal of the third detecting unit is connected to the input terminal (Vdd) and a terminal of the fourth detecting unit is connected to the ground terminal, wherein a first output portion is provided at an intermediate point between the first detecting unit and the first resistive unit, and a second output portion is provided at an intermediate point between the first resistive unit and the second detecting unit, wherein a third output portion is provided at an intermediate point between the third detecting unit and the second resistive unit, and a fourth output portion is provided at an intermediate portion between the second resistive unit and the fourth detecting unit, and wherein the first output portion and the fourth output portion are connected to a first comparator, and the second output portion and the third output portion are connected to a second comparator.