The purpose of the present study was to investigate the effects of “fear” and “credibility of others' behavior (subject's belief that someone knows the correct escape route)” on conformity and fixation of the subject's choice of an escape route. The experiment was conducted in a 2 (fear=FE vs. non-fear=NF)×2 (high credibility=HC vs. low credibility=LC) factorial design. In the early stage of the experiment, the degree of conformity was greater in the FE condition than in the NF condition. However, in the later stage, conformity gradually fell down in the FE condition but not in the NF condition. The increase rate in conformity was higher in the HC condition than in the LC condition. The degree of fixation on a given route was higher in the FE condition than in the NF condition.