Suppose that you find an article including an illustration that looks interesting, you might read it. My collaborator and I call this phenomenon the motivation effect of illustrations. We proposed an experimental method to evaluate the motivation effect of instructional manuals. In this method, participants were allowed to glance at one manual page for two seconds and were then asked to answer the following two questions: (a) “Did the page motivate you to read?” and (b) “Did the page look easy to understand?” The method was utilized to demonstrate that illustrations enhanced participants’ motivation for reading. But, in this previous study, participants glanced at the same stimuli twice or more in a single experiment, so the procedure could skew the motivation effect. The purpose of this study is reassessing the motivation effect of illustrations when the said problem is improved. As a result, findings of the study prove the validity of the motivation effect of illustrations.