We are interested in utilizing egocentric view from a wearable camera and are working on MonoEye system, a novel system to estimate the wearer's motion using a chest-mounted camera equipped with an ultra-wide fisheye lens. Because our system has a wide field of view, it provides a balanced capacity of recognizable pose types and broad egocentric view. The prototype deep neural network estimates camera wearer's 3D pose and acquires motion without complex configuration like conventional motion capture systems.