PURPOSE: To arrange pools wastelessly and efficiently with respect to space by floating a floating body on a deep diving pool and providing a-swimming pool at the center of the floating body to form a flowing pool on the outside of the swimming pool.

CONSTITUTION: A flat and elliptic floating body 3 is floated on a diving pool 2, a floating floor 4a is installed on the inner surface of the main body 3a of the floating body 3 to form a swimming pool 4, and a groove is formed in the upper part of the main body 3a to use it as a flowing pool 5. Next, when the floating body 4a is rigid, the floating body 4a is supported by a truss frame 20 bridged inside the floating body 3. Then water is fed from a septic water tank 16 to a jet water feed circle tube 19 through a feed tube 18 by a jet water pump 17, and fed from a jet nozzle to the pool 5. Then after filling the pool 5, water passes a connecting port 7 and flows into the pool 4 and, in addition, passes a connecting tube 8 and enters the pool 5. Thus the pools 2, 4, and 5 can be arranged efficiently by combining them three-dimensionally.