A pipe-fitting comprising: a main body including: a plurality of pipe receiving portions (111, 112) for receiving a plurality of pipes therein respectively; and a hollow joint for connecting the plurality of pipe receiving portions (111, 112) to each other; a sealing member (120, 121) received in a sealing member-receiving groove defined in a distal end of each pipe receiving portion (111, 112), wherein the sealing member (120, 121) is configured to seal between each pipe receiving portion (111, 112) and each pipe inserted into each pipe receiving portion (111, 112); and a fixing-cap (130, 131) having a through-hole defined therein through which each pipe passes, wherein the fixing-cap (130, 131) is screwed to the distal end of each pipe receiving portion (111, 112) to press the sealing member (120, 121) to be brought into close contact with each pipe, characterized in that a fixing-cap stopper (140, 141) is formed on an outer circumferential face of the distal end of each pipe receiving portion (111, 112), wherein the fixing-cap stopper (140, 141) supports a proximal end of the fixing-cap (130, 131) when each fixing-cap (130, 131) is screwed to the distal end of each pipe receiving portion (111, 112) and protrudes in a radial direction from the outer circumferential face of the distal end of the pipe receiving portion, the fixing-cap stopper (140, 141) includes a fixing-cap fixing portion (142a, 142b, 142c, 142d) including a plurality of fixing protrusions (172a, 172b, 172c) protruding in a direction toward the proximal end of the fixing-cap (130, 131) and in a direction opposite to the insertion direction of the pipe, wherein the fixing-cap fixing portion extends radially longer than the rest of the fixing-cap stopper from the outer peripheral surface of the distal end of the pipe receiving portion, and, a plurality of fixing-protrusion-receiving grooves is defined in the proximal end of each fixing-cap (130, 131) for receiving the fixing protrusions (172a, 172b, 172c) therein respectively. a main body including: a plurality of pipe receiving portions (111, 112) for receiving a plurality of pipes therein respectively; and a hollow joint for connecting the plurality of pipe receiving portions (111, 112) to each other; a sealing member (120, 121) received in a sealing member-receiving groove defined in a distal end of each pipe receiving portion (111, 112), wherein the sealing member (120, 121) is configured to seal between each pipe receiving portion (111, 112) and each pipe inserted into each pipe receiving portion (111, 112); and a fixing-cap (130, 131) having a through-hole defined therein through which each pipe passes, wherein the fixing-cap (130, 131) is screwed to the distal end of each pipe receiving portion (111, 112) to press the sealing member (120, 121) to be brought into close contact with each pipe, characterized in that a fixing-cap stopper (140, 141) is formed on an outer circumferential face of the distal end of each pipe receiving portion (111, 112), wherein the fixing-cap stopper (140, 141) supports a proximal end of the fixing-cap (130, 131) when each fixing-cap (130, 131) is screwed to the distal end of each pipe receiving portion (111, 112) and protrudes in a radial direction from the outer circumferential face of the distal end of the pipe receiving portion, the fixing-cap stopper (140, 141) includes a fixing-cap fixing portion (142a, 142b, 142c, 142d) including a plurality of fixing protrusions (172a, 172b, 172c) protruding in a direction toward the proximal end of the fixing-cap (130, 131) and in a direction opposite to the insertion direction of the pipe, wherein the fixing-cap fixing portion extends radially longer than the rest of the fixing-cap stopper from the outer peripheral surface of the distal end of the pipe receiving portion, and, a plurality of fixing-protrusion-receiving grooves is defined in the proximal end of each fixing-cap (130, 131) for receiving the fixing protrusions (172a, 172b, 172c) therein respectively.