AbstractLong time learning tires learners, and then the learners' attention or concentration degreases. The author measured the learners' mental workload in e-learning using an eye mark recorder (Ueno 2004). Almost of all learners begin to feel some mental workload in e-learning 18 minute after they started to learn. The main idea of this paper is to propose an animated agent to maintain learner's attention during the learning. The animated agent provides some attention cues when the learners begin to feel some mental workload. Some experiments using the eye mark recorder in this study show that the proposed animated agent relieves the learners' mental workload.