Electronic Journal of Differential Equations, Vol. 2012 (2012), No. 03, pp. 1-8. Title: Newton's method for stochastic differential equations and its probabilistic second-order error estimate Author: Kazuo Amano (Gunma Univ., Kiryu, Japan) Abstract: Kawabata and Yamada [5] proposed an implicit Newton's method for nonlinear stochastic differential equations and proved its convergence. Later Amano [2] gave an explicit formulation of method and showed its direct error estimate. In this article, we prove a probabilistic second-order error estimate which has been an open problem since 1991. Submitted June 27, 2011. Published January 04, 2012. Math Subject Classifications: 60H10, 65C30. Key Words: Newton's method; stochastic differential equation; second order error estimate.