A suturing device (1) is disclosed which sutures a tissue using a suture unit (103) having a suture thread (104) with both ends fitted to a first anchor (106) and a second anchor (107), respectively. The suturing device (1) includes: a hollow tip member (4) receiving the first and second anchors (106,107) a wire (5) having a front end inserted through the tip member (4) so that the first and second anchors (106,107) can be released from the tip member (4) a flexible tube (7) having a distal end integrally connected to a proximal end portion of the tip member (4), through which the wire (5) is inserted so as to freely move forward and backward in the axial direction of the tube (7) a main body (12) fixed to a proximal end of a sheath (8) through which the tube (7) is inserted and a sliding portion (13) fixed to the proximal end of the tube (7) and fitted to the main body (12) so as to freely move with respect to the main body (12) in the axial direction in a sliding manner. The sliding portion (13) includes a slider (15) fixed to the proximal end of the tube (7), and a slider control portion (16) which controls a sliding movement of the slider (15) with respect to the main body (12) in a normal state, and deactivates the control by a predetermined operation.
