A position detection device includes a magnetic detection element, a wiring, a first component and a second component as a first mold resin, a terminal, and a sensor cover as a second mold resin. The magnetic detection element can detect a change in magnetic field. The wiring is connected to the magnetic detection element. The first component and the second component mold the magnetic detection element and the wiring so that the wiring is exposed. The terminal is connected to the wiring. The sensor cover molds the first component, the second component and the terminal so that the first component and the second component where the magnetic detection element is located are exposed, and has a deformation suppressing portion. The deformation suppressing portion suppresses the deformation of the first component or the second component when the sensor cover is deformed.