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.