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Dies with high accuracy in shape is difficult to be machined with a small diameter end-mill, since the end-mill defiects on a 1arge scale at a cutting point due to cuuing forces, In this research, relationship between machining errors and cutting forces in sideway cutting with a small diarneter end-mill is investigated experimentally in order to estimate the defiection of end-mill at a cutting point by using measured cutting forces, As a result, it was concluded that machining errors could be estimated from thrust forces at the moment when the cutting point without defiection of an end-mill exceeds slightly from the cutting point closest to finished surface during its rotation.