This suturing device suturing device includes a tubular insertion portion having flexibility； a suturing portion disposed at a distal end portion of the insertion portion, the suturing portion holding a tubular anchor through which a suture thread is insertable； an operation portion disposed at a proximal end portion of the insertion portion； and a suture thread grasping portion inserted through the insertion portion, the suture thread grasping portion being configured to be insertable through the anchor, wherein the suturing portion includes an installation surface on which the anchor is held； a pressing member including a convex portion for pressing the anchor, the convex portion being arranged to face the installation surface； and a driver connected to the operation portion, the driver configured to operate the pressing member, and wherein the anchor is sandwiched between the installation surface and the convex portion to be pressed, and thus the anchor is deformed to a substantial V shape by driving the driver.
