Occupants' attention ability in seven PMV conditions is measured by means of electroencephalogram (EEG) and verbal voting. This can show us occupants' attention state change by time and environmental condition. To achieve the objective of this study, seven healthy male students' EEG was measured in seven PMV conditions each. Their EEG was measured in each condition for 65 minutes. EEG was measured on Fp1 and Fp2, and sorted out according to the frequency using power spectral analysis. The following results were achieved. First, in scope of moderate temperature environment, a higher level of attention was shown in relatively lower temperatures than in higher temperatures. Second, higher level of attention was shown in higher temperature in extreme condition compared to extremely cold temperature. Third, the occupants' attention ability, measured by EEG varied with time and was found to be different than the occupants' perceived attention from a verbal vote.