<p>In this paper, we propose an augmented reality (AR) system with a leaser show device as a hands-on display at a science museum. The AR system provides virtual information which learners can handle visual explanation on an exhibited item. Accordingly, the learner certainly understand his/her knowledge through the AR display without any modification to the item and/or the existing displayed explanation. Using the AR system, we have conducted intensive experiments for children visitors at Gamagori Museum of Earth, Life and the Sea". In the experiments, we have evaluated the following points: i) the AR display makes learners interested in the exhibited item; ii) students can easily handle the AR display; and iii) the AR display is useful for learners to construct their knowledge. As a result, we conclude that the AR display system enabled learners to construct their knowledge in reality. And that the system makes learners interested in the exhibited items. </p>