A scroll compressor comprising: a partition plate for partitioning a hermetic container into a high pressure space and a low pressure space; a stationary scroll abutting on the partition plate and including a stationary spiral lap; an orbiting scroll including an orbiting spiral lap engaged with the stationary spiral lap of the stationary scroll, and forming a compressing chamber between the stationary spiral lap and the orbiting spiral lap; a self-rotation preventing member for preventing the orbiting scroll from rotating; and a main bearing for supporting the orbiting scroll, wherein the stationary scroll, the orbiting scroll, the self-rotation preventing member, and the main bearing are disposed in the low pressure space, wherein the stationary scroll is movable between the partition plate and the main bearing in an axial direction, wherein the scroll compressor further comprises: a bearing-side engagement section formed on the main bearing; a scroll-side engagement section formed on the stationary scroll; and a pillar-shaped member, of which lower section is inserted into the bearing-side engagement section, and of which upper section is inserted into the scroll-side engagement section and a boss section formed on a top face of the stationary scroll, the boss section forming a discharge space between the partition plate and the stationary scroll, wherein the discharge space communicates with the high pressure space via a second discharge port, and wherein a lower end-face of an engagement section between the pillar-shaped member and the scroll-side engagement section is located above a lap end-face of the stationary spiral lap in the axial direction characterized in that a first discharge port is formed at a center portion of the boss section and a bypass port is provided near the first discharge port in the boss section, that the bypass port is provided with a bypass check valve being capable of blocking the bypass port, and that the first discharge port and the bypass port allow a compression chamber of the scroll compressor to communicate with the discharge space. a partition plate for partitioning a hermetic container into a high pressure space and a low pressure space; a stationary scroll abutting on the partition plate and including a stationary spiral lap; an orbiting scroll including an orbiting spiral lap engaged with the stationary spiral lap of the stationary scroll, and forming a compressing chamber between the stationary spiral lap and the orbiting spiral lap; a self-rotation preventing member for preventing the orbiting scroll from rotating; and a main bearing for supporting the orbiting scroll, wherein the stationary scroll, the orbiting scroll, the self-rotation preventing member, and the main bearing are disposed in the low pressure space, wherein the stationary scroll is movable between the partition plate and the main bearing in an axial direction, wherein the stationary scroll, the orbiting scroll, the self-rotation preventing member, and the main bearing are disposed in the low pressure space, wherein the stationary scroll is movable between the partition plate and the main bearing in an axial direction, a bearing-side engagement section formed on the main bearing; a scroll-side engagement section formed on the stationary scroll; and a pillar-shaped member, of which lower section is inserted into the bearing-side engagement section, and of which upper section is inserted into the scroll-side engagement section and a boss section formed on a top face of the stationary scroll, the boss section forming a discharge space between the partition plate and the stationary scroll, wherein the discharge space communicates with the high pressure space via a second discharge port, and wherein a lower end-face of an engagement section between the pillar-shaped member and the scroll-side engagement section is located above a lap end-face of the stationary spiral lap in the axial direction characterized in that a first discharge port is formed at a center portion of the boss section and a bypass port is provided near the first discharge port in the boss section, that the bypass port is provided with a bypass check valve being capable of blocking the bypass port, and that the first discharge port and the bypass port allow a compression chamber of the scroll compressor to communicate with the discharge space. wherein the discharge space communicates with the high pressure space via a second discharge port, and wherein a lower end-face of an engagement section between the pillar-shaped member and the scroll-side engagement section is located above a lap end-face of the stationary spiral lap in the axial direction characterized in that a first discharge port is formed at a center portion of the boss section and a bypass port is provided near the first discharge port in the boss section, that the bypass port is provided with a bypass check valve being capable of blocking the bypass port, and that the first discharge port and the bypass port allow a compression chamber of the scroll compressor to communicate with the discharge space.