It is possible for the tips of all the electrodes to make contact with the scalp with greater reliability even with respect to different subjects, by adaptation to individual differences in the heads of subjects, and the functional status of the brain can be detected with greater accuracy. A brain function detection apparatus is provided which has a hat-shaped apparatus main body for mounting on the head of a subject, a plurality of electrodes for detecting brain wave signals, which are mounted in the apparatus main body separated from each other at intervals, and which are arranged in contact with the scalp, and the apparatus main body has a plurality of holder pieces in which at least one electrode is mounted, a bendable belt for linking the holder pieces, and a holder piece interval-adjusting apparatus for adjusting the distance between the holder pieces.
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