To provide the lifting and lowering floor device for a pool or the like usable as a skating rink capable of using it as the skating rink during a period not using the pool and remarkably improving the facility availability factor of this king of the pool.

In the lifting and lowering floor device of a pool or the like enabling the height adjustment of a floor face by lifting and lowering and driving the floor face fitted to the opening of the pool or the like by a lifting and lowering means, a lifting and lowering floor is divided into a plurality of blocks, each floor face block is provided with a gas sealing means for giving buoyancy for the floor faces 40a-40c, the lifting and lowering floor being the peripheral edge part of the lifting and lowering floor being the skating rink is liftably constituted at a higher position than the peripheral edge part face of the pool.