An injection bag that is formed of a multilayer film, the injection bag comprising: an innermost layer that is formed of a polypropylene-based resin; an outermost layer that is formed of a polypropylene-based resin; an intermediate layer that is situated between the innermost layer and the outermost layer; and two adhesive layers that are situated on either side of the intermediate layer, the intermediate layer including a mixture of 60 to 90 mass% of a crystalline polyamide resin and 10 to 40 mass% of a noncrystalline polyamide resin, the crystalline polyamide resin having a combined content of a monomer and a low-molecular-weight polymer of 0.8 mass% or less, measured according to JIS K6810, the noncrystalline polyamide resin selected from the group consisting of: isophthalic acid/terephthalic acid/hexamethylenediamine polycondensate, an isophthalic acid/terephthalic acid/hexamethylenediamine/bis(3-methyl-4-aminocyclohexyl)methane polycondensate, a terephthalic acid/2,2,4-trimethylhexamethylenediamine/2,4,4-trimethylhexamethylenediamine polycondensate, an isophthalic acid/bis(3-methyl-4-aminocyclohexyl)methane/omega-laurolactam polycondensate, an isophthalic acid/2,2,4-trimethylhexamethylenediamine/2,4,4-trimethylhexamethylenediamine polycondensate, an isophthalic acid/terephthalic acid/2,2,4-trimethylhexamethylenediamine/2,4,4-trimethylhexamethylenediamine polycondensate, an isophthalic acid/bis(3-methyl-4-aminocyclohexyl)methane/omega-laurolactam polycondensate, and mixtures thereof, and the injection bag having a maximum UV absorbance measured in accordance with the Test Methods for Plastic Containers specified in the Japanese Pharmacopoeia 16th Edition of 0.08 or less. an innermost layer that is formed of a polypropylene-based resin; an outermost layer that is formed of a polypropylene-based resin; an intermediate layer that is situated between the innermost layer and the outermost layer; and two adhesive layers that are situated on either side of the intermediate layer, the intermediate layer including a mixture of 60 to 90 mass% of a crystalline polyamide resin and 10 to 40 mass% of a noncrystalline polyamide resin, the crystalline polyamide resin having a combined content of a monomer and a low-molecular-weight polymer of 0.8 mass% or less, measured according to JIS K6810, the noncrystalline polyamide resin selected from the group consisting of: isophthalic acid/terephthalic acid/hexamethylenediamine polycondensate, an isophthalic acid/terephthalic acid/hexamethylenediamine/bis(3-methyl-4-aminocyclohexyl)methane polycondensate, a terephthalic acid/2,2,4-trimethylhexamethylenediamine/2,4,4-trimethylhexamethylenediamine polycondensate, an isophthalic acid/bis(3-methyl-4-aminocyclohexyl)methane/omega-laurolactam polycondensate, an isophthalic acid/2,2,4-trimethylhexamethylenediamine/2,4,4-trimethylhexamethylenediamine polycondensate, an isophthalic acid/terephthalic acid/2,2,4-trimethylhexamethylenediamine/2,4,4-trimethylhexamethylenediamine polycondensate, an isophthalic acid/bis(3-methyl-4-aminocyclohexyl)methane/omega-laurolactam polycondensate, and mixtures thereof, and the injection bag having a maximum UV absorbance measured in accordance with the Test Methods for Plastic Containers specified in the Japanese Pharmacopoeia 16th Edition of 0.08 or less.