The magnetic moments in the triangular antiferromagnetic CsMnBr3 order at TN=8.3 K with a frustration of the magnetic moments in a 120° type magnetic structure. The magnetic moments are either ordered in a clockwise or an anticlockwise direction resulting in a chirality ordering, which is characterized by the critical exponent of the magnetic sublattice magnetization β=0.25. It has been shown that an electric field applied along the  direction removes the chiral ordering and a linear Ising-like phase will be established; consequently, the value of β decreases. The subsequent application of a magnetic field of B=4 T along the  direction causes the critical exponent β to increase. The magnetic phase diagram of CsMnBr3 does not change due to the introduction of an electric field.© 1997 American Institute of Physics.