A rotary compressor comprising: a vertically-positioned airtight compressor housing, in an upper section of which a discharge unit of a refrigerant is provided and in a lower section of which an inlet unit (104, 105) of the refrigerant is provided and lubricant oil is stored; a compressing unit that is disposed in the lower section of the compressor housing and that compresses the refrigerant sucked in via the inlet unit (104, 105) and discharges the refrigerant from the discharge unit; a motor that is disposed in the upper section of the compressor housing and drives the compressing unit via a rotation shaft; and a lubricating mechanism (159A, 159B) that supplies the lubricant oil stored in the lower section of the compressor housing to a sliding portion of the compressing unit through a vertical lubricating hole (155, 155a) and a horizontal lubricating hole (156a to 156d) of the rotation shaft, characterized in that the horizontal lubricating hole (156a to 156d) of the lubricating mechanism (159A, 159B) has been drilled in the rotation shaft, and the drilling direction of the horizontal lubricating hole (156a to 156d) has been inclined from the same direction as an eccentric direction of an eccentric portion (152S, 152T) that is provided on the rotation shaft and causes an annular piston of the compressing unit to make an orbital motion in a cylinder, and is positioned between the same direction as the eccentric direction of the eccentric portion (152S, 152T) and an 80° phase shifted direction from the same direction as the eccentric direction in a direction opposite to a rotation direction of the rotation shaft. a vertically-positioned airtight compressor housing, in an upper section of which a discharge unit of a refrigerant is provided and in a lower section of which an inlet unit (104, 105) of the refrigerant is provided and lubricant oil is stored; a compressing unit that is disposed in the lower section of the compressor housing and that compresses the refrigerant sucked in via the inlet unit (104, 105) and discharges the refrigerant from the discharge unit; a motor that is disposed in the upper section of the compressor housing and drives the compressing unit via a rotation shaft; and a lubricating mechanism (159A, 159B) that supplies the lubricant oil stored in the lower section of the compressor housing to a sliding portion of the compressing unit through a vertical lubricating hole (155, 155a) and a horizontal lubricating hole (156a to 156d) of the rotation shaft, characterized in that the horizontal lubricating hole (156a to 156d) of the lubricating mechanism (159A, 159B) has been drilled in the rotation shaft, and the drilling direction of the horizontal lubricating hole (156a to 156d) has been inclined from the same direction as an eccentric direction of an eccentric portion (152S, 152T) that is provided on the rotation shaft and causes an annular piston of the compressing unit to make an orbital motion in a cylinder, and is positioned between the same direction as the eccentric direction of the eccentric portion (152S, 152T) and an 80° phase shifted direction from the same direction as the eccentric direction in a direction opposite to a rotation direction of the rotation shaft.