A surgical system having a surgical device (1, 1A, 1C, 1D, 1E) for small-pit closure in hollow organs with said surgical device being a suturing device (a) formed so as to be freely insertable through an operating channel (202a, 202b) of an endoscope inserted into a hollow organ, or (b) formed to be directly and freely inserted into a hollow organ, or (c) mounted along the outer surface of an endoscope inserted into a hollow organ and extending to the leading-end portion of the endoscope, so as to suture tissue at the site of a small pit (Tc) in the hollow organ by using a suture member (100, 100A, 110, 120) that includes (a) at least one pair of first and second arrowy-shaped members (101, 101A, 111, 121, 102, 102A, 112, 122) having engaging parts (101c, 101Ac, 102c, 102Ac, 111c, 112c, 121c, 122c) that engage with tissue in the hollow organ, and (b) a suture thread (103, 113, 123, 133, 143) that is attached by one of its ends (first end) to the rear end of the first arrowy-shaped member and that is inserted into and pulled freely through the rear end of the second arrowy-shaped member, with said system also having a capsule endoscope that either is accommodated inside the leading end of the surgical device or is inserted directly into the hollow organ, or through an operating channel (202a, 202b) of an endoscope inserted into a hollow organ, with said surgical device including: a suture-member cartridge (5, 5A, 5B, 5C) constituting the leading-end portion of the surgical device and having at least one pair of tubes (51, 51B) arranged parallel to each other, or mounted along the outer surface of the leading-end portion of the endoscope, whereby the suture thread is diverted around leading ends of the tubes or passed through small holes or slit-like openings (53, 53B) provided in opposing side walls of the tubes and is fixed by the opposite (second) end of the suture thread to the inner surface on the leading end side of the tube member that accommodates the second arrowy-shaped member, with the arrowy-shaped member linked by the suture thread forming a pair that are respectively accommodated in the tubes; a hollow-organ-insertable unit (2, 2A, 2C) that includes flexible air tubes that are coupled to the rear end of the suture-member cartridge; and a gas shooter that is coupled to the rear end of the hollow-organ-insertable unit (2, 2A, 2C) outside the hollow organ and that includes a cylinder unit (4A1, 4B1, 41) that has (a) a piston (4A1, A1b, 4B1b, 41b) that, through its operation, generates compressed air, and (b) a high-pressure-gas reservoir (4A2a) that stores high-pressure gas, with said compressed air or high-pressure gas being released through an ejection hole (4A1h, 4B1f, 41f) in response to trigger (4A4, 4B4, 44) operations of the gas shooter (4, 4A, 4B) and sequentially ejected into the suture-member cartridge (5, 5A, 5B, 5C) via the hollow-organ-insertable unit (2, 2A, 2C); and the arrowy-shaped members are sequentially ejected from the suture-member cartridge (5, 5A, 5B, 5C) by compressed air or high-pressure gas sequentially ejected into the suture-member cartridge (5, 5A, 5B, 5C) and are driven into tissue in the hollow organ on both sides of the small-pit site (Tc), with the rear ends of the arrowy-shaped members being drawn together via the suture thread (103, 113, 123, 133, 143) linking those rear ends so as to tightly suture the small-pit site. a suture-member cartridge (5, 5A, 5B, 5C) constituting the leading-end portion of the surgical device and having at least one pair of tubes (51, 51B) arranged parallel to each other, or mounted along the outer surface of the leading-end portion of the endoscope, whereby the suture thread is diverted around leading ends of the tubes or passed through small holes or slit-like openings (53, 53B) provided in opposing side walls of the tubes and is fixed by the opposite (second) end of the suture thread to the inner surface on the leading end side of the tube member that accommodates the second arrowy-shaped member, with the arrowy-shaped member linked by the suture thread forming a pair that are respectively accommodated in the tubes; a hollow-organ-insertable unit (2, 2A, 2C) that includes flexible air tubes that are coupled to the rear end of the suture-member cartridge; and a gas shooter that is coupled to the rear end of the hollow-organ-insertable unit (2, 2A, 2C) outside the hollow organ and that includes a cylinder unit (4A1, 4B1, 41) that has (a) a piston (4A1, A1b, 4B1b, 41b) that, through its operation, generates compressed air, and (b) a high-pressure-gas reservoir (4A2a) that stores high-pressure gas, with said compressed air or high-pressure gas being released through an ejection hole (4A1h, 4B1f, 41f) in response to trigger (4A4, 4B4, 44) operations of the gas shooter (4, 4A, 4B) and sequentially ejected into the suture-member cartridge (5, 5A, 5B, 5C) via the hollow-organ-insertable unit (2, 2A, 2C);