A compressor used in a refrigeration circuit at least including a condenser, an expander, an evaporator, the compressor comprising: an inlet port connectable to a low-pressure side of this refrigeration circuit; a suction chamber that houses a working fluid delivered from the inlet port; a compression mechanism that compresses the working fluid suctioned from the suction chamber; and a suction passage that connects the inlet port and the suction chamber, a check valve assembly that only allows a flow of the working fluid in a direction from the inlet port to the suction chamber is disposed on the suction passage, and pressure equalizing means that allows discharge of the working fluid from the suction chamber to the inlet port only when a pressure of the suction chamber is higher than a pressure of the inlet port is formed on the outside of an internal passage of the check valve assembly, wherein the check valve assembly includes: a valve housing having a housing space therein, and including an inflow port communicating between the inlet port and the housing space, and an outflow port communicating between the suction chamber and the housing space; a valve body that is housed in the housing space and moves within the housing space on the basis of a pressure difference across the valve body so as to regulate an opening amount of the outflow port; and an urging member that urges the valve body in a direction to reduce the opening amount of the outflow port and close the inflow port, the valve housing of the check valve assembly has a fitted section that is loosely fitted to a holding section formed in the suction passage in such a manner that axial movement thereof is allowed, and the pressure equalizing means is formed by blocking the flow of the working fluid on the outside of the valve housing in the case where the fitted section abuts an edge portion of the holding section on the suction chamber side and by allowing the flow of the working fluid on the outside of the valve housing in the case where the fitted section separates from the edge portion of the holding section on the suction chamber side. an inlet port connectable to a low-pressure side of this refrigeration circuit; a suction chamber that houses a working fluid delivered from the inlet port; a compression mechanism that compresses the working fluid suctioned from the suction chamber; and a suction passage that connects the inlet port and the suction chamber, a check valve assembly that only allows a flow of the working fluid in a direction from the inlet port to the suction chamber is disposed on the suction passage, and pressure equalizing means that allows discharge of the working fluid from the suction chamber to the inlet port only when a pressure of the suction chamber is higher than a pressure of the inlet port is formed on the outside of an internal passage of the check valve assembly, wherein the check valve assembly includes: a valve housing having a housing space therein, and including an inflow port communicating between the inlet port and the housing space, and an outflow port communicating between the suction chamber and the housing space; a valve body that is housed in the housing space and moves within the housing space on the basis of a pressure difference across the valve body so as to regulate an opening amount of the outflow port; and an urging member that urges the valve body in a direction to reduce the opening amount of the outflow port and close the inflow port, the valve housing of the check valve assembly has a fitted section that is loosely fitted to a holding section formed in the suction passage in such a manner that axial movement thereof is allowed, and the pressure equalizing means is formed by blocking the flow of the working fluid on the outside of the valve housing in the case where the fitted section abuts an edge portion of the holding section on the suction chamber side and by allowing the flow of the working fluid on the outside of the valve housing in the case where the fitted section separates from the edge portion of the holding section on the suction chamber side. a valve housing having a housing space therein, and including an inflow port communicating between the inlet port and the housing space, and an outflow port communicating between the suction chamber and the housing space; a valve body that is housed in the housing space and moves within the housing space on the basis of a pressure difference across the valve body so as to regulate an opening amount of the outflow port; and an urging member that urges the valve body in a direction to reduce the opening amount of the outflow port and close the inflow port, the valve housing of the check valve assembly has a fitted section that is loosely fitted to a holding section formed in the suction passage in such a manner that axial movement thereof is allowed, and the pressure equalizing means is formed by blocking the flow of the working fluid on the outside of the valve housing in the case where the fitted section abuts an edge portion of the holding section on the suction chamber side and by allowing the flow of the working fluid on the outside of the valve housing in the case where the fitted section separates from the edge portion of the holding section on the suction chamber side.