A temperature detection device (1 to 5) to be assembled to a coil , the temperature detection device (1 to 5) comprising: a temperature sensor that includes a thermosensitive element detecting temperature of the coil ; a holder that holds the temperature sensor and positions the coil with respect to the temperature sensor ; and an elastic body configured to sandwich the temperature sensor and the coil that are positioned by the holder through a positioning portion of the holder , wherein the holder includes a concave portion configured to accommodate the coil and the temperature sensor , wherein an extending part of the coil and the temperature sensor are inserted in the concave portion of the holder , the holder further includes a sensor holding portion and a holder body portion , the sensor holding portion being configured to hold the temperature sensor , and the holder body portion being externally provided with the elastic body and having a function of positioning the extending part of the coil and the temperature sensor in the inside, the concave portion being provided inside the holder body portion , the elastic body is movable to an attachment position where the elastic body is attached to the holder to sandwich the temperature sensor and the coil , and a separated position where the elastic body is separated from the temperature sensor when the coil is positioned with respect to the temperature sensor by the holder , the elastic body is U-shaped, the elastic body includes a first sandwiching portion , a second sandwiching portion and a coupling portion which couples the first sandwiching portion and the second sandwiching portion , and the elastic body is movable along a direction orthogonal to both of a sandwiching direction (D1) in which the temperature sensor and the coil are sandwiched, and a longitudinal direction of a part of the coil to which the temperature detection device (1 to 5) is assembled. a temperature sensor that includes a thermosensitive element detecting temperature of the coil ; a holder that holds the temperature sensor and positions the coil with respect to the temperature sensor ; and an elastic body configured to sandwich the temperature sensor and the coil that are positioned by the holder through a positioning portion of the holder , wherein the holder includes a concave portion configured to accommodate the coil and the temperature sensor , wherein an extending part of the coil and the temperature sensor are inserted in the concave portion of the holder , the holder further includes a sensor holding portion and a holder body portion , the sensor holding portion being configured to hold the temperature sensor , and the holder body portion being externally provided with the elastic body and having a function of positioning the extending part of the coil and the temperature sensor in the inside, the concave portion being provided inside the holder body portion , the elastic body is movable to an attachment position where the elastic body is attached to the holder to sandwich the temperature sensor and the coil , and a separated position where the elastic body is separated from the temperature sensor when the coil is positioned with respect to the temperature sensor by the holder , the elastic body is U-shaped, the elastic body includes a first sandwiching portion , a second sandwiching portion and a coupling portion which couples the first sandwiching portion and the second sandwiching portion , and the elastic body is movable along a direction orthogonal to both of a sandwiching direction (D1) in which the temperature sensor and the coil are sandwiched, and a longitudinal direction of a part of the coil to which the temperature detection device (1 to 5) is assembled. <EOS>