A liftway work platform device and a liftway work platform device arranging method are disclosed and can reliably enable a height position of a landing to be consistent with a height position of a work platform. The liftway work platform device is provided with a plurality of support parts (1), a lower part pedestal part (2) and a lower part work platform (3), wherein the support parts are erected on a bottom pit (102) of a liftway (100), the lower part pedestal part (2) is arranged on the support parts (1), the longitudinal positon of the lower part pedestal part can be adjusted relative to the support parts (1), and the lower part work platform (3) is supported by the lower part pedestal part (2). The lower part pedestal part (2) is provided with a pedestal main body part (21) which supports the lower part work platfor (3) and a fixed part (22) arranged on the pedestal main body part (21), and the fixed part is fixed via a car platform sill guide rail (103) in a longitudinal direction.