A core supporter provided with: a belt-shaped lower band section that is wound around and fixed to the pelvis of a user； a X-shaped stretchable middle band section that has a pair of one end parts joined to the lower band section and that presses against the vicinity of the hips of a user； and a pair of upper band sections that are joined to the pair of other end parts of the middle band section and that is wound around and fixed to the chest of a user. The pair of one end parts of the middle band section are joined to the lower band section over a range from a position at the side of the pelvis of the user to a position in front of the vicinity thereof. The pair of upper band sections are separated from each other and extend in opposite directions from each other in a deployed state, and are wound around and fixed to the vicinity of the fifth to the tenth rib of the chest of the user.
