A suction device (10) includes: a suction portion (11) that sucks an external fluid a piezoelectric pump (21) that includes a piezoelectric element (22) vibrating when a drive voltage is applied thereto and sucks the fluid via the suction portion (11) by vibration of the piezoelectric element (22) a detection circuit (32) that detects a phase difference between a current flowing through the piezoelectric element (22) and the drive voltage for the piezoelectric element and a control unit (33) that performs a process on the basis of the phase difference detected by the detection circuit (32).
