To prevent vibration of a valve caused by opening/closing of a discharge valve when a pump is operated for preventing generation of noise by vibration of the valve.

This diaphragm pump has at least one diaphragm part. A pump chamber is formed of the diaphragm part and a valve housing. The discharge valve is disposed at a corresponding position to a diaphragm part of the valve housing. A gas collecting body having a discharge port is installed on the valve housing. The gas collecting body has a vibration preventing member extended toward the valve housing. The vibration preventing member is composed to be close to the discharge valve at its tip, or in such a way that it is pressed. Vibration of the discharge valve is thus restricted, thereby generation of noise is reduced.