A syringe holder for holding a syringe comprising: a base that is provided with a plurality of insertion through holes through which syringes are inserted; a plurality of wall parts having a cylindrical shape that project respectively from opening end edges of the plurality of insertion through holes of the base , the wall parts having an inner diameter that is the same as a diameter of the insertion through holes ; and ribs , each of which connects each adjacent ones of the plurality of wall parts , wherein the ribs have a height from the base of 40% or more and 100% or less of a height from the base of the wall parts , the wall parts have an inner diameter of 100% or more and 115% or less of an outer diameter of barrels of the syringes , and at least an inner wall surface of each of the wall parts is made from a material including polyethylene as a main component, and wherein the inner circumference surfaces of the insertion through holes are configured to increase in diameter toward the rear side of the base , and the distal end portions of the inner wall surfaces of the walls are configured to increase in diameter toward the distal end , wherein each wall part has an inner wall surface that constitutes an inner circumference surface of the wall part , and an outer wall surface that constitutes an outer circumference surface of the wall part , characterised in that the thickness of each wall part decreases from the proximal end toward the distal end , and wherein at each wall part , the inner wall surface is formed straight so as to be parallel with the axial direction in a portion other than the distal end portion, while the outer wall surface is formed to incline inward in the radial direction toward the distal end . a base that is provided with a plurality of insertion through holes through which syringes are inserted; a plurality of wall parts having a cylindrical shape that project respectively from opening end edges of the plurality of insertion through holes of the base , the wall parts having an inner diameter that is the same as a diameter of the insertion through holes ; and ribs , each of which connects each adjacent ones of the plurality of wall parts , wherein the ribs have a height from the base of 40% or more and 100% or less of a height from the base of the wall parts , the wall parts have an inner diameter of 100% or more and 115% or less of an outer diameter of barrels of the syringes , and at least an inner wall surface of each of the wall parts is made from a material including polyethylene as a main component, and wherein the inner circumference surfaces of the insertion through holes are configured to increase in diameter toward the rear side of the base , and the distal end portions of the inner wall surfaces of the walls are configured to increase in diameter toward the distal end , wherein each wall part has an inner wall surface that constitutes an inner circumference surface of the wall part , and an outer wall surface that constitutes an outer circumference surface of the wall part , characterised in that the thickness of each wall part decreases from the proximal end toward the distal end , and wherein at each wall part , the inner wall surface is formed straight so as to be parallel with the axial direction in a portion other than the distal end portion, while the outer wall surface is formed to incline inward in the radial direction toward the distal end . <EOS>