A compressor (A) comprising: a base portion which partitions a compression side and a discharge side ; a discharge port penetrating the base portion ; and a valve body in which one end is fixed to the base portion , the other end faces the discharge port to close the discharge port , and when a pressure on the compression side becomes larger than a pressure on the discharge side , the other end is elastically deformed to open the discharge port , wherein the discharge port has a compression side hole portion provided on the compression side , and a discharge side hole portion provided on the discharge side , wherein the discharge side hole portion communicates with the compression side hole portion through a communication portion provided on the bottom side of the compression side hole portion and the bottom side of the discharge side hole portion , and the discharge side hole portion has a discharge opening , characterized in that the discharge side hole portion has a bulging portion at an end portion on the discharge side , the bulging portion being bulging to a side which is separated from the one end of the valve body being fixed to the base portion further than an inner circumferential surface of the compression side hole portion in a plan view orthogonal to the center line of the discharge side hole portion in part of an inner circumferential surface of the discharge side hole portion , and an opening area of the compression side hole portion is larger than an opening area of the discharge opening of the discharge side hole portion , and in that the opening area of the communication portion , which is the area of the portion surrounded by a boundary line (X) between the compression side hole portion and the discharge side hole portion , is formed to be equal to or larger than the cross-sectional area of the discharge side hole portion . a base portion which partitions a compression side and a discharge side ; a discharge port penetrating the base portion ; and a valve body in which one end is fixed to the base portion , the other end faces the discharge port to close the discharge port , and when a pressure on the compression side becomes larger than a pressure on the discharge side , the other end is elastically deformed to open the discharge port , wherein the discharge port has a compression side hole portion provided on the compression side , and a discharge side hole portion provided on the discharge side , wherein the discharge side hole portion communicates with the compression side hole portion through a communication portion provided on the bottom side of the compression side hole portion and the bottom side of the discharge side hole portion , and the discharge side hole portion has a discharge opening , characterized in that the discharge side hole portion has a bulging portion at an end portion on the discharge side , the bulging portion being bulging to a side which is separated from the one end of the valve body being fixed to the base portion further than an inner circumferential surface of the compression side hole portion in a plan view orthogonal to the center line of the discharge side hole portion in part of an inner circumferential surface of the discharge side hole portion , and an opening area of the compression side hole portion is larger than an opening area of the discharge opening of the discharge side hole portion , and in that the opening area of the communication portion , which is the area of the portion surrounded by a boundary line (X) between the compression side hole portion and the discharge side hole portion , is formed to be equal to or larger than the cross-sectional area of the discharge side hole portion . <EOS>