Extensive reading (ER) is an instructional option steadily gaining support and recognition in second language (L2) reading pedagogy. Even though many attempts have been made to unravel the impact of ER on L2 development, there is a paucity of investigation into the affective domains of reading. The current study helps fill this gap by examining the effect of ER on L2 reading attitude. Participants were 61 undergraduates learning English as a foreign language at a Japanese university. Five attitudinal variables were measured using a 22-item questionnaire scored on a Likert scale in the categories of Comfort, Anxiety, Intellectual Value, Practical Value, and Linguistic Value. After the removal of Linguistic Value because of a ceiling effect, the result showed increases in Comfort and Intellectual Value and a decrease in Anxiety, with no effect on Practical Value. Implications for research and pedagogy are discussed. (Contains 1 table and 1 note.)