There is provided a MEMS device which includes a second substrate which is disposed with an interval from a first substrate, and an interposed member which is interposed between the first substrate and the second substrate, and which has space which is defined by the first substrate, the second substrate, and the interposed member, in which the first substrate includes a wiring which extends from a first surface side which is a surface on a side opposite to the second substrate toward a second surface side which is a surface of the second substrate side and is made of a conductor, in which an end portion of the first surface side of the wiring is covered by a first protective film provided on the first surface side, and in which an end portion of the second surface side of the wiring faces the space.