A pipe-fitting comprising: a main body including: a plurality of pipe receiving portions for receiving a plurality of pipes therein respectively; and a hollow joint for connecting the plurality of pipe receiving portions to each other; a sealing member received in a sealing member-receiving groove defined in a distal end of each pipe receiving portion , wherein the sealing member is configured to seal between each pipe receiving portion and each pipe inserted into each pipe receiving portion ; and a fixing-cap having a through-hole defined therein through which each pipe passes, wherein the fixing-cap is screwed to the distal end of each pipe receiving portion to press the sealing member to be brought into close contact with each pipe, characterized in that a fixing-cap stopper is formed on an outer circumferential face of the distal end of each pipe receiving portion , wherein the fixing-cap stopper supports a proximal end of the fixing-cap when each fixing-cap is screwed to the distal end of each pipe receiving portion and protrudes in a radial direction from the outer circumferential face of the distal end of the pipe receiving portion, the fixing-cap stopper includes a fixing-cap fixing portion including a plurality of fixing protrusions protruding in a direction toward the proximal end of the fixing-cap 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 for receiving the fixing protrusions therein respectively. a main body including: a plurality of pipe receiving portions for receiving a plurality of pipes therein respectively; and a hollow joint for connecting the plurality of pipe receiving portions to each other; a sealing member received in a sealing member-receiving groove defined in a distal end of each pipe receiving portion , wherein the sealing member is configured to seal between each pipe receiving portion and each pipe inserted into each pipe receiving portion ; and a fixing-cap having a through-hole defined therein through which each pipe passes, wherein the fixing-cap is screwed to the distal end of each pipe receiving portion to press the sealing member to be brought into close contact with each pipe, characterized in that a fixing-cap stopper is formed on an outer circumferential face of the distal end of each pipe receiving portion , wherein the fixing-cap stopper supports a proximal end of the fixing-cap when each fixing-cap is screwed to the distal end of each pipe receiving portion and protrudes in a radial direction from the outer circumferential face of the distal end of the pipe receiving portion, the fixing-cap stopper includes a fixing-cap fixing portion including a plurality of fixing protrusions protruding in a direction toward the proximal end of the fixing-cap 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 for receiving the fixing protrusions therein respectively. <EOS>