A stent includes a wavy-shaped member extending circumferentially, and expandable and contractable in the radial direction of the stent. The wavy-shaped member includes a pair of straight parts, an apex part and an opening. The ends of the apex part are connected to the straight parts. The opening is positioned at least in the apex part. The apex part has a link part at the outer circumference side of the opening, and a base part at the inner circumference side of the opening. The base part has a curved inner circumference and the link part lies across a vertex of the base part. The width of the link part in relation to the circumferential direction of the stent is smaller than the width of the base part in relation to the circumferential direction of the stent, at the vertex of the base part.