A safety feature prevents a two wheeled electric paper lift from raising a paper tray on uneven ground that includes a tilt switch positioned in parallel with an upper limit switch that controls the height in a vertical direction of the paper tray. The instrument device includes an indicator panel, an instrument main part, an indicator needle provided to the instrument main part, a transparent light-guiding member disposed on the indicator panel, and a light source that emits a light beam into the light-guiding member. The ball is resiliently mounted in the socket and the socket receives a slide bushing.