To provide a biodegradable laminated film which has biodegradability and is excellent in moisture-proofing properties.

In the biodegradable laminated film, a moisture-proofing layer is formed on at least one side of a biaxially oriented polylactic acid film, and the moisture-proofing layer contains a biodegradable resin and natural wax. The content of the natural wax in the moisture-proofing layer is 1-100 pts. mass per 100 pts. mass of the biodegradable resin. The water vapor permeability in an atmosphere of 40°C and 100% RH of the laminated film is 50 g/(m2×day) or below. The number average molecular weight of the biodegradable resin is 20,000 or below, and the biodegradable resin is an aliphatic-aromatic copolyester.