There is provided an in-ear information acquiring apparatus including: an information acquiring unit that is inserted in the ernal auditory canal and acquires information inside the ear and a fixing mechanism that fixes the information acquiring unit inside the ernal auditory canal, wherein the fixing mechanism includes: a rod portion having a plurality of support portions, which are erected toward a wall surface of the ernal auditory canal, provided on an outer side surface thereof around an outer circumference thereof at at least one location along the ernal auditory canal and an adjusting portion adjusting an erect state of the support portions provided on the rod portion.
