An injection bag is formed of a laminate film, and includes an intermediate layer that includes 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 has a combined content of a monomer and a low-molecular-weight polymer of 0.8 mass% or less. The noncrystalline polyamide resin includes a semi-aromatic polyamide.