The present study aimed to examine the effects of self-oriented perfectionism and responsibility on the information gathering behavior. Participants were divided into two groups on the basis of Multidimensional Self-oriented Perfectionism Scale (MSPS), that is, 21 for high- and 21 for low- perfectionism participants. They were asked to prepare a test by gathering information, which was designated as either important or unimportant sentences and either brief or detailed ones. Results were as follows. High perfectionists collected both of important information: they collected not only brief but also detailed sentences. High perfectionists under high responsibility condition collected unimportant information completely more than any other groups. Thus this finding indicates that self-oriented perfectionists under responsibility collect information excessively regardless of its importance.