A fluid control device (100) includes a piezoelectric pump (10), a suction unit (9), and a valve (101). The piezoelectric pump (10) has a suction hole (53) for a gas and a discharge hole (24) for the gas. The suction unit (9) includes a container (90), a suction port (91), and a connection hole (92). The valve (101) includes a first ventilation hole (111), a second ventilation hole (112), a third ventilation hole (113), a first valve housing (191), a second valve housing (192), and a diaphragm (120). The first ventilation hole (111) of the valve (101) is connected to the connection hole (92) of the suction unit (9). The second ventilation hole (112) of the valve (101) is connected to the suction hole (53) of the piezoelectric pump (10). The third ventilation hole (113) of the valve (101) is opened under atmospheric pressure. The diaphragm (120) is clamped between the first valve housing (191) and the second valve housing (192) and forms a first region and a second region.
