Provided is a suture device capable of reliably inserting a suture needle into a target portion of a tissue. A suture device (10) comprising: a suture needle (20) which has a needle section (21) consisting of a shape memory alloy, having a pointed tip, and having provided at the tip thereof a needle hole (23) through which a suture thread can be passed, and also has an operation thread (28) which is connected to the base end of the needle section (21) through a connection section (27) and moves the needle section (21) in a predetermined direction； and a tube-like member (30) which slidably contains the suture needle (20). The tip of the tube-like member (30) comprises a pointed piercing section (33), and the suture needle (20) is configured to extend and retract within the inner periphery of the piercing section (33).
