Cell detachment device, vibration element, cell detachment device control method, and medium

A method for controlling a cell detachment device that generates a first vibration and uses the first vibration to detach a culture cell from a culture vessel, the cell detachment device comprising:

• a piezoelectric element in which a second vibration is excited by applying a first alternating current using a first electrode and a second electrode;
• and a vibrated system in which the second vibration propagates, including a vibration member to which the piezoelectric element is fixed and on which the culture vessel mounted, the method comprising the steps of:
• detecting a second alternating current excited by the piezoelectric element by the first vibration generated in the vibrated system caused by the second vibration;
• determining whether a voltage related to the second alternating current is lower than or equal to a threshold value;
• and
• causing a display unit to display information that the first vibration of the vibrated system at a time of obtaining the second alternating current is not appropriate in a case where the voltage is less than or equal to the threshold value.