To solve a problem of taking much trouble for setting work at a working site as a filler receiver to use for a conventional cooling tower is extremely large and heavy.

This structural body 6 is constituted to be engaged with a receiver locking part 4 by forming a plurality of rows of shelf parts 3 in parallel with an air circulating direction in a lower part water tank 2 of a cooling tower 1, arranging a plurality of the receiver locking parts 4 on upper surfaces of at least two rows of the shelf parts 3 and setting a plurality of filler receiver 5 in the orthogonal direction of the shelf parts 3.