A scroll compressor in which a compressing mechanism for compressing refrigerant and an electric mechanism for driving the compressing mechanism are placed in a hermetic container, the compressing mechanism includes a fixed scroll, an orbiting scroll and a rotation shaft for driving the orbiting scroll in an orbiting manner, the fixed scroll includes a disk-like fixed scroll mirror plate and a fixed spiral lap standing on the fixed scroll mirror plate, the orbiting scroll includes a disk-like orbiting scroll mirror plate, an orbiting spiral lap standing on a lap-side end surface of the orbiting scroll mirror plate, and a boss portion formed on an opposite side from the lap-side end surface of the orbiting scroll mirror plate, an eccentric shaft inserted into the boss portion is formed on an upper end of the rotation shaft, the fixed spiral lap and the orbiting spiral lap are meshed with each other, and a plurality of compression chambers are formed between the fixed spiral lap and the orbiting spiral lap, as the compression chamber, a first compression chamber is formed on an outer wall side of the orbiting spiral lap, and a second compression chamber is formed on an inner wall side of the orbiting spiral lap, a suction volume of the first compression chamber is made larger than a suction volume of the second compression chamber, a main bearing for supporting the fixed scroll and the orbiting scroll is provided below the fixed scroll and the orbiting scroll, a bearing for pivotally supporting the rotation shaft and a boss storing section for storing the boss portion therein are formed on the main bearing, a rotation restraining member for restraining rotation of the orbiting scroll is provided between the fixed scroll and the main bearing, and the boss storing section is a high pressure region, an outer periphery of the orbiting scroll where the rotation restraining member is placed is an intermediate pressure region, and the orbiting scroll is pushed against the fixed scroll, characterized in that the fixed scroll mirror plate is provided with an intermediate pressure extraction hole through which intermediate pressure of the compression chamber is taken out, that an intermediate pressure communication path for bringing the intermediate pressure extraction hole and the intermediate pressure region into communication with each other is formed in the fixed scroll, that a high pressure communication path for bringing the intermediate pressure extraction hole and a high pressure space in the hermetic container into communication with each other is formed in the fixed scroll, and that a balance valve is provided in a high pressure opening of the high pressure communication path. a compressing mechanism for compressing refrigerant and an electric mechanism for driving the compressing mechanism are placed in a hermetic container, the compressing mechanism includes a fixed scroll, an orbiting scroll and a rotation shaft for driving the orbiting scroll in an orbiting manner, the fixed scroll includes a disk-like fixed scroll mirror plate and a fixed spiral lap standing on the fixed scroll mirror plate, the orbiting scroll includes a disk-like orbiting scroll mirror plate, an orbiting spiral lap standing on a lap-side end surface of the orbiting scroll mirror plate, and a boss portion formed on an opposite side from the lap-side end surface of the orbiting scroll mirror plate, an eccentric shaft inserted into the boss portion is formed on an upper end of the rotation shaft, the fixed spiral lap and the orbiting spiral lap are meshed with each other, and a plurality of compression chambers are formed between the fixed spiral lap and the orbiting spiral lap, as the compression chamber, a first compression chamber is formed on an outer wall side of the orbiting spiral lap, and a second compression chamber is formed on an inner wall side of the orbiting spiral lap, a suction volume of the first compression chamber is made larger than a suction volume of the second compression chamber, a main bearing for supporting the fixed scroll and the orbiting scroll is provided below the fixed scroll and the orbiting scroll, a bearing for pivotally supporting the rotation shaft and a boss storing section for storing the boss portion therein are formed on the main bearing, a rotation restraining member for restraining rotation of the orbiting scroll is provided between the fixed scroll and the main bearing, and the boss storing section is a high pressure region, an outer periphery of the orbiting scroll where the rotation restraining member is placed is an intermediate pressure region, and the orbiting scroll is pushed against the fixed scroll, characterized in that the fixed scroll mirror plate is provided with an intermediate pressure extraction hole through which intermediate pressure of the compression chamber is taken out, that an intermediate pressure communication path for bringing the intermediate pressure extraction hole and the intermediate pressure region into communication with each other is formed in the fixed scroll, that a high pressure communication path for bringing the intermediate pressure extraction hole and a high pressure space in the hermetic container into communication with each other is formed in the fixed scroll, and that a balance valve is provided in a high pressure opening of the high pressure communication path.