To provide an inhibitor switch capable of avoiding unintentional conduction due to conductive foreign matter in oil while controlling manufacturing cost by insulating parting section of a parting part of a contact plate while covering a parting hole.

In the inhibitor switch 1 provided with a terminal stand 2 fixed in a transmission case, contact plates 3, 4 formed on the terminal stand, an operation part operating along the contact plates 3, 4 with interlocking with the select lever of a vehicle, a movable contact 5b capable of sliding on the contact plates 3, 4 and forming a predetermined electric circuit according to a contact position thereof, the parting parts 8, 9 divided to block conduction, and the parting hole 10 allowing a cutting means to be fitted therein, a cover member 11 attached to the terminal stand 2 with covering the paring hole 10 and formed out of an insulating body including a projection part 11a inserted in the parting holes 10 respectively under an attached condition and reaching parting section of the parting part is provided.

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