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The ergonomics of assembly operations affects standard operation times and assembly reliability. It is a complicated time-consuming task to estimate the ergonomics parameters of operations in assembly cells. Assembly operations are simulated in a virtual environment, and ergonomic parameters including the visibility of an assembling part, posture and reachability of an operator are quantified automatically by using images of the assembling part which are automatically generated. The highest score among the image is selected as the ergonomics score of the assembly operation. The proposed method is tested by applying it to the assembly operations of a PC. In this paper, we propose an automatic estimation method of the ergonomics score of assembly sequence. There are two distinctive features of the proposed method. 1. Plural cameras are pointed from multi-directions to a part to be assembled and each camera captures image of the part. From the images and the poses of cameras, four ergonomics parameters are estimated. 2. Four ergonomics parameters estimated by these methods are; visibility, eye sight direction against the assembly motion, glance affection to the operator's neck and reachability to the final position of the assembly part. We verified the validity of this method in a demonstration of assembly sequence of a PC box.