  We study the phase transition of the $\pm J$ Heisenberg model in three
dimensions. Using a dynamical simulation method that removes a drift of the
system, the existence of the spin-glass (SG) phase at low temperatures is
suggested. The transition temperature is estimated to be $T_{\rm SG} \sim
0.18J$ from both equilibrium and off-equilibrium Monte-Carlo simulations. Our
result contradicts the chirality mechanism of the phase transition reported
recently by Kawamura which claims that it is not the spins but the chiralities
of the spins that are ordered in Heisenberg SG systems.
