An electric treatment device includes an impedance detector to measure bioelectrical impedance at a site of a body of a user, using electrodes in contact with the site, a voltage controller to perform treatment of the site by controlling a voltage applied to the electrodes, a storage to store a current value corresponding to an electric stimulation intensity provided to the site and desired by the user, and a voltage controller to set a target voltage value of the applied voltage based on the measured bioelectrical impedance and the current value stored in the storage. The voltage controller increases the voltage value of the applied voltage until the target voltage value set by the voltage controller is reached.