A scroll compressor , comprising: - a hermetic container into which refrigerant gas is drawn through a suction pipe ; - a compression mechanism disposed in the hermetic container , including a fixed scroll and an orbiting scroll , and configured to compress the refrigerant gas; - a motor mechanism disposed in the hermetic container ; - a rotation shaft configured to transmit torque of the motor mechanism to the orbiting scroll ; and - an injection port for introducing refrigerant flowing into the compression mechanism through an injection pipe that is different from the suction pipe , wherein the fixed scroll and the orbiting scroll each includes a baseplate and a spiral body , wherein the compression mechanism has a compression chamber that is closed between the spiral body of the fixed scroll and the spiral body of the orbiting scroll , and a suction chamber that is unclosed and into which the refrigerant gas in the hermetic container is sucked, and wherein the injection port is provided on the baseplate of the fixed scroll , characterised in that the injection port opens only to the suction chamber , and, in all phases of rotation of the rotation shaft , is located on an inner side of an outer edge of a structure unit in which the spiral body of the fixed scroll and the spiral body of the orbiting scroll are assembled with each other, wherein, as the injection port extends from an inlet to an outlet of the injection port , the injection port is inclined toward an inside of the spiral bodies in a spiral direction, or wherein, as the injection port extends from an inlet to an outlet of the injection port , the injection port is inclined toward a wall surface of the spiral body of the fixed scroll or toward a wall surface of the spiral body of the orbiting scroll . - a hermetic container into which refrigerant gas is drawn through a suction pipe ; - a compression mechanism disposed in the hermetic container , including a fixed scroll and an orbiting scroll , and configured to compress the refrigerant gas; - a motor mechanism disposed in the hermetic container ; - a rotation shaft configured to transmit torque of the motor mechanism to the orbiting scroll ; and - an injection port for introducing refrigerant flowing into the compression mechanism through an injection pipe that is different from the suction pipe , wherein the fixed scroll and the orbiting scroll each includes a baseplate and a spiral body , wherein the compression mechanism has a compression chamber that is closed between the spiral body of the fixed scroll and the spiral body of the orbiting scroll , and a suction chamber that is unclosed and into which the refrigerant gas in the hermetic container is sucked, and wherein the injection port is provided on the baseplate of the fixed scroll , characterised in that the injection port opens only to the suction chamber , and, in all phases of rotation of the rotation shaft , is located on an inner side of an outer edge of a structure unit in which the spiral body of the fixed scroll and the spiral body of the orbiting scroll are assembled with each other, wherein, as the injection port extends from an inlet to an outlet of the injection port , the injection port is inclined toward an inside of the spiral bodies in a spiral direction, or wherein, as the injection port extends from an inlet to an outlet of the injection port , the injection port is inclined toward a wall surface of the spiral body of the fixed scroll or toward a wall surface of the spiral body of the orbiting scroll . <EOS>