24-03E

The hyperkagome-lattice S = 1/2 Heisenberg ferromagnet is studied by means of (i) the linear spin-wave theory, (ii) the double-time temperature Green's functions, (iii) high-temperature expansions, and (iv) quantum Monte Carlo simulations to examine the effect of lattice geometry on the finite-temperature properties. We have found that the Curie temperature T_c for the hyperkagome-lattice (frustrated lattice) ferromagnet is about 0.33|J| that is smaller than T_c for the diamond-lattice (another three-dimensional lattice with the same coordination number 4 but bipartite one) ferromagnet by about 25%.