  The three-dimensional $\pm J$ Heisenberg spin-glass model is investigated by
the non-equilibrium relaxation method from the paramagnetic state. Finite-size
effects in the non-equilibrium relaxation are analyzed, and the relaxation
functions of the spin-glass susceptibility and the chiral-glass susceptibility
in the infinite-size system are obtained. The finite-time scaling analysis
gives the spin-glass transition at $T_{\rm sg}/J=0.21_{-0.02}^{+0.01}$ and the
chiral-glass transition at $T_{\rm cg}/J=0.22_{-0.03}^{+0.01}$. The results
suggest that both transitions occur simultaneously. The critical exponent of
the spin-glass susceptibility is estimated as $\gamma_{\rm sg}= 1.7 \pm 0.3$,
which makes an agreement with the experiments of the insulating and the
canonical spin-glass materials.
