A scroll compressor having an injection function, the injection function including: suctioning a low-pressure working fluid; injecting an intermediate pressure working fluid into a compression chamber in a process of compressing the low-pressure working fluid; and discharging a high-pressure working fluid, the scroll compressor comprising: the compression chamber including a compression chamber partitioning member ; an intermediate pressure chamber guiding the intermediate pressure working fluid before the injection to the compression chamber , wherein the intermediate pressure chamber and the compression chamber face each other with the compression chamber partitioning member interposed between the intermediate pressure chamber and the compression chamber , the intermediate pressure chamber includes: an intermediate pressure chamber inlet through which the intermediate pressure working fluid flows in; an injection port inlet of an injection port through which the intermediate pressure working fluid is injected into the compression chamber ; and a liquid reservoir formed at a position below the intermediate pressure chamber inlet , the liquid reservoir including the compression chamber partitioning member , characterized in that the intermediate pressure chamber is formed of a fixed scroll , an intermediate pressure plate and an intermediate pressure cover constituting the intermediate pressure chamber partitioning member ; and the intermediate pressure plate is provided with a check valve that prevents backflow of the working fluid from the compression chamber to the intermediate pressure chamber . the compression chamber including a compression chamber partitioning member ; an intermediate pressure chamber guiding the intermediate pressure working fluid before the injection to the compression chamber , wherein the intermediate pressure chamber and the compression chamber face each other with the compression chamber partitioning member interposed between the intermediate pressure chamber and the compression chamber , the intermediate pressure chamber includes: an intermediate pressure chamber inlet through which the intermediate pressure working fluid flows in; an injection port inlet of an injection port through which the intermediate pressure working fluid is injected into the compression chamber ; and a liquid reservoir formed at a position below the intermediate pressure chamber inlet , the liquid reservoir including the compression chamber partitioning member , characterized in that the intermediate pressure chamber is formed of a fixed scroll , an intermediate pressure plate and an intermediate pressure cover constituting the intermediate pressure chamber partitioning member ; and the intermediate pressure plate is provided with a check valve that prevents backflow of the working fluid from the compression chamber to the intermediate pressure chamber . an intermediate pressure chamber inlet through which the intermediate pressure working fluid flows in; an injection port inlet of an injection port through which the intermediate pressure working fluid is injected into the compression chamber ; and a liquid reservoir formed at a position below the intermediate pressure chamber inlet , the liquid reservoir including the compression chamber partitioning member , characterized in that the intermediate pressure chamber is formed of a fixed scroll , an intermediate pressure plate and an intermediate pressure cover constituting the intermediate pressure chamber partitioning member ; and the intermediate pressure plate is provided with a check valve that prevents backflow of the working fluid from the compression chamber to the intermediate pressure chamber . <EOS>