The present invention relates to a diaphragm pump which can provide the convenience in maintenance such as replacement or inspection. The provided diaphragm pump includes: a first housing (31) composed of a first inner cap (39) and a first outer cap (40); a second housing (32) composed of a second inner cap (42) and a second outer cap (43); a thin film first diaphragm (51) to be coupled in the first housing (31); a thin film second diaphragm (52) to be coupled in the second housing (32); an inhalation pipe (34) and a discharge pipe (35) to be connected so as to supply or transfer fluid; and a center block (33) incorporated with a spindle (60) and a valve unit (62).
