An aspirator (10) includes a pump, a detecting unit, and a control unit. The pump is driven by a piezoelectric element (22) and has a suction portion and a discharge portion. The detecting unit includes a current detector (32) and a regulator (33), and detects a closed state of the suction portion. The control unit includes the regulator (33) and a voltage controller (34), and regulates an output voltage for the piezoelectric element (22) in accordance with the closed state of the suction portion detected by the detecting unit.
