A rotary compressor containing a compression mechanism part for compressing refrigerant and a motor for driving the compression mechanism part via a crank shaft in a hermetic container, wherein the compression mechanism part includes: two bearings (6, 7) supporting the crank shaft rotatably; at least one cylinder arranged between the two bearings (6, 7) and compressing the refrigerant by a piston fitted rotatably to the crank shaft; and a fastening member and a fastening bolt fastening the two bearings (6, 7) and the at least one cylinder, wherein one of the two bearings is provided with a mounting hole which penetrates in an axial direction; wherein the other of the two bearings is provided with a hole which penetrates in the axial direction; wherein the at least one cylinder is provided with a screw hole which penetrates in the axial direction, wherein the fastening member includes: a head to transmit rotational force of a fastening tool; a seating face having a larger diameter than the mounting hole and from which the head is provided in a standing position; a neck having a smaller diameter than the mounting hole, provided in a standing position from the seating face at an opposite side to the head, and inserted in the mounting hole; an external thread having a smaller diameter than the neck, connected to the neck, and screwed in the screw hole; an internal thread drilled on a same axis with the external thread at a part including at least the head at an inner side of the head and the neck; and an inner circumference escape part having a larger diameter than the internal thread and drilled on the same axis with the external thread at a part including at least a part of the neck and the external thread at the inner side of the neck and the external thread, and wherein the fastening bolt is screwed in the internal thread of the fastening member through the hole provided at the other of the two bearings, the screw hole, and the inner circumference escape part of the fastening member. two bearings (6, 7) supporting the crank shaft rotatably; at least one cylinder arranged between the two bearings (6, 7) and compressing the refrigerant by a piston fitted rotatably to the crank shaft; and a fastening member and a fastening bolt fastening the two bearings (6, 7) and the at least one cylinder, a head to transmit rotational force of a fastening tool; a seating face having a larger diameter than the mounting hole and from which the head is provided in a standing position; a neck having a smaller diameter than the mounting hole, provided in a standing position from the seating face at an opposite side to the head, and inserted in the mounting hole; an external thread having a smaller diameter than the neck, connected to the neck, and screwed in the screw hole; an internal thread drilled on a same axis with the external thread at a part including at least the head at an inner side of the head and the neck; and an inner circumference escape part having a larger diameter than the internal thread and drilled on the same axis with the external thread at a part including at least a part of the neck and the external thread at the inner side of the neck and the external thread, and