A carriage lifting/lowering device includes: a first lifting/lowering rail; a second lifting/lowering rail; a first lifting/lowering drive unit configured to lift and lower the first lifting/lowering rail; a second lifting/lowering drive unit configured to lift and lower the second lifting/lowering rail; a first body unit configured to movably support the first lifting/lowering rail along a first face in an lifting/lowering direction; a second body unit configured to movably support the second lifting/lowering rail in the lifting/lowering direction, along a second face facing the first face; and a pair of support frames disposed across the first body unit and the second body unit, with a maintenance step being disposed across the pair of support frames. The pair of support frames are disposed in an extending direction of the first lifting/lowering rail and the second lifting/lowering rail, and sandwich a lifting/lowering space.