There are provided an antenna holder and the like allowing antennas to be arranged at appropriate positions on the stomach side and the back side of a subject without much labor. An antenna holder (1A) includes a first antenna accommodating section (10) and a second antenna accommodating section (20) which are separate bodies, and a belt (30) for joining together, and fixing to a subject, the first antenna accommodating section (10) and the second antenna accommodating section (20), where the first antenna accommodating section (10) includes antenna pockets (120a to 120e) arranged on a first base (111) and two belt connection sections (164a, 164b), and where the second antenna accommodating section (20) includes antenna pockets (120f, 120g) arranged on a second base (211) and belt insertion sections (213, 215) through which the belt (30) is to be inserted in a movable manner.
