Abstract
We study in the framework of R-parity violating supersymmetric theories the effect of R-parity violation due to the operator L <sub>i</sub> L <sub>j</sub> Ē <sub>k</sub> on the (V - A) structure of the muon decay. The precisely measured muon decay parameters can constrain a product of R-parity violating couplings: |λ <sub>232</sub> λ <sup>131</sup> | < 0.022 at the 90% CL, which is complementary to the previous limits obtained by the e-μ universality in τ decay. © 1998 Published by Elsevier Science B.V. All rights reserved.