Disclosed is to a single electron device, a method of manufacturing the same, and a method of simultaneously manufacturing a single electron device and an MOS transistor. A waterproof lid covers an entire surface of the waterproof area, and includes an annular protrusion that fits into the annular groove in the waterproof area, and an elastic resin portion that covers the annular protrusion. A slide assembly supporting the table assembly includes a fixed plate, an intermediate plate, and a full-motion plate which extend by means of rack-and-pinion drives. The armature is located proximate the inlet portion of the body, and is operatively connected to the needle. In one embodiment a Teflon spacer is interposed between the seal member and the sleeve.