This fluid control device (10) comprises a valve (20) and a pump (30). The valve (20) has a valve chamber (200). A first main plate (21) has a first opening part (201) through which the interior and exterior of the valve chamber (200) communicate, and a second main plate (22) has a second opening part (202) through which the interior and exterior of the valve chamber (200) communicate. A valve (24) capable of switching the communication state is disposed inside the valve chamber (200). The pump (30) has a piezoelectric element (332) and a pump chamber (300). The pump chamber (300) communicates with the valve chamber (200) via the second opening part (22). During bending vibration of a vibrating part (33), the frequency coefficient of the first main plate (21) is greater than the frequency coefficient of the second main plate (22).
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