A compressor comprising: a discharge chamber; a compression chamber; a valve plate arranged between the discharge chamber and the compression chamber, wherein the valve plate includes a fixing surface, which is exposed to the discharge chamber, and a discharge port, which communicates the discharge chamber and the compression chamber; and an elastically deformable discharge reed valve including a fixed portion, which is fixed to the fixing surface in contact with the fixing surface, a base portion, which extends in a longitudinal direction of the discharge reed valve from the fixed portion and is separable from the valve plate, and a valve portion, which further extends in the longitudinal direction from the base portion to open and close the discharge port, wherein the valve portion has a central region with a center and a distal region including an edge at a distal end in the longitudinal direction, and the valve plate includes an annular seal surface that is flush with the fixing surface and can come into contact with the valve portion around the discharge port, a recessed groove located outward from the seal surface and arranged in the fixing surface, wherein the recessed groove includes a bottom separated from the edge of the valve portion, a receiving surface that is flush with the fixing surface and comes into contact with the distal region, characterized by an extended portion (45, 47) that extends from the receiving surface toward the center of the discharge port, wherein the extended portion (45, 47) is continuous with the seal surface and flush with the fixing surface, wherein: the extended portion (45, 47) includes a support surface (45a, 47a; 45d, 47d) and one of a communication groove (45b, 47b) and a recessed portion (45e, 47e) that are arranged in the support surface (45a, 47a; 45d, 47d); the support surface (45a, 47a; 45d, 47d) can come into contact with the central region of the valve portion excluding the center of the valve portion; the communication groove (45b, 47b) comes into communication with the discharge port when the discharge port is closed; and the recessed portion (45e, 47e) does not come into communication with the discharge port when the discharge port is closed. a discharge chamber; a compression chamber; a valve plate arranged between the discharge chamber and the compression chamber, wherein the valve plate includes a fixing surface, which is exposed to the discharge chamber, and a discharge port, which communicates the discharge chamber and the compression chamber; and an elastically deformable discharge reed valve including a fixed portion, which is fixed to the fixing surface in contact with the fixing surface, a base portion, which extends in a longitudinal direction of the discharge reed valve from the fixed portion and is separable from the valve plate, and a valve portion, which further extends in the longitudinal direction from the base portion to open and close the discharge port, wherein the valve portion has a central region with a center and a distal region including an edge at a distal end in the longitudinal direction, and the valve plate includes an annular seal surface that is flush with the fixing surface and can come into contact with the valve portion around the discharge port, a recessed groove located outward from the seal surface and arranged in the fixing surface, wherein the recessed groove includes a bottom separated from the edge of the valve portion, a receiving surface that is flush with the fixing surface and comes into contact with the distal region, characterized by an extended portion (45, 47) that extends from the receiving surface toward the center of the discharge port, wherein the extended portion (45, 47) is continuous with the seal surface and flush with the fixing surface, wherein: the extended portion (45, 47) includes a support surface (45a, 47a; 45d, 47d) and one of a communication groove (45b, 47b) and a recessed portion (45e, 47e) that are arranged in the support surface (45a, 47a; 45d, 47d); the support surface (45a, 47a; 45d, 47d) can come into contact with the central region of the valve portion excluding the center of the valve portion; the communication groove (45b, 47b) comes into communication with the discharge port when the discharge port is closed; and the recessed portion (45e, 47e) does not come into communication with the discharge port when the discharge port is closed.