To provide a switching device for rotation transmission of making it possible to switch the driving from lift moving to horizontal moving with one driving source.

At the driving part of wheelchair lifter, which puts in and out to the back part floor of car F, a screw shaft for horizontal moving 1 and a screw shaft for lift moving are set in parallel and the driven gears 3, 4 are set on the both base end parts. A driving gear 7 is set on the driving shaft 6 that is connected to the power source 5 opposed to the driven gears 3, 4. A gear change mechanism, which selects one of the driven gear for horizontal moving 3 and driven gear for lift moving 4 and makes be enable to engage, is set against the driving gear 7 through a change gear 8.