To provide a chest supporter achieving a flat chest by breaking down swell of the breast and easy to attach and detach.

This belt-like chest supporter supporting the woman's chest has in the internal surface, a pair of right and left hold parts which are made of a non stretchable material and covers the chest, and a flexible part which is made of a stretchable material and connects a pair of the right and left hold parts on the back side to cover the back. The external surface has a round cover part which is made of a stretchable material and connected with the hold part and the flexible part on the periphery, and a connection part which connects a pair of the right and left hold parts on the chest.