A compressor, comprising: a housing member, in which an injection passage communicating with a compression chamber (Sc) where refrigerant is compressed is formed; a check valve arranged in the injection passage; and an injection pipe configured to supply refrigerant to the injection passage, characterised in that the check valve has a valve body slidably arranged in the injection passage, and a valve supporting member (52, 152) arranged on an injection pipe side relative to the valve body, the valve supporting member (52, 152) being configured to restrict movement of the valve body toward the injection pipe side when the check valve checks a flow of refrigerant from the compression chamber to the injection pipe, a center hole (51 a) is formed in a center part of the valve body, a peripheral hole (52a, 152a) is formed in the valve supporting member, the peripheral hole opposing a rim part of the valve body located on a rim side relative to the center hole, refrigerant passing through the peripheral hole and the center hole and is supplied to the compression chamber when refrigerant is supplied from the injection pipe to the compression chamber, and the center hole is configured to be closed by the valve supporting member, and the peripheral hole is configured to be closed by the rim part of the valve body when the check valve checks the flow of refrigerant from the compression chamber to the injection pipe, wherein the housing member has a valve seating face, arranged on an opposite side of the valve supporting member relative to the valve body, the valve seating face being configured to restrict movement of the valve body in a direction of flow of refrigerant when refrigerant is supplied from the injection pipe to the compression chamber, the injection passage includes an injection port arranged downstream of the valve seating face in the direction of flow of refrigerant when refrigerant is supplied from the injection pipe to the compression chamber, and the injection port directly communicates with the compression chamber, and flow passage areas of the center hole and of the peripheral hole are respectively larger than a flow passage area of the injection port. a housing member, in which an injection passage communicating with a compression chamber (Sc) where refrigerant is compressed is formed; a check valve arranged in the injection passage; and an injection pipe configured to supply refrigerant to the injection passage, characterised in that the check valve has a valve body slidably arranged in the injection passage, and a valve supporting member (52, 152) arranged on an injection pipe side relative to the valve body, the valve supporting member (52, 152) being configured to restrict movement of the valve body toward the injection pipe side when the check valve checks a flow of refrigerant from the compression chamber to the injection pipe, a center hole (51 a) is formed in a center part of the valve body, a peripheral hole (52a, 152a) is formed in the valve supporting member, the peripheral hole opposing a rim part of the valve body located on a rim side relative to the center hole, refrigerant passing through the peripheral hole and the center hole and is supplied to the compression chamber when refrigerant is supplied from the injection pipe to the compression chamber, and the center hole is configured to be closed by the valve supporting member, and the peripheral hole is configured to be closed by the rim part of the valve body when the check valve checks the flow of refrigerant from the compression chamber to the injection pipe, wherein the housing member has a valve seating face, arranged on an opposite side of the valve supporting member relative to the valve body, the valve seating face being configured to restrict movement of the valve body in a direction of flow of refrigerant when refrigerant is supplied from the injection pipe to the compression chamber, the injection passage includes an injection port arranged downstream of the valve seating face in the direction of flow of refrigerant when refrigerant is supplied from the injection pipe to the compression chamber, and the injection port directly communicates with the compression chamber, and flow passage areas of the center hole and of the peripheral hole are respectively larger than a flow passage area of the injection port.