Assist device

An assist device comprising:

• a first body-worn unit that is worn on at least either shoulders or a chest of a user;
• a second body-worn unit that is worn on either each of right and left legs or a waist of the user;
• a belt body that is provided to extend along a back side of the user, from the first body-worn unit to the second body-worn unit;
• an actuator that is provided in either the first body-worn unit or the second body-worn unit and allows a part of the belt body to be reeled and unreeled;
• a battery configured to supply electricity to the actuator;
• and
• a controller configured to control the actuator, wherein
• the controller is configured such that when a remaining charge level of the battery has decreased to a predetermined set value, the controller executes a vibrating motion process of causing the actuator to perform a vibrating motion of intermittently repeating reeling of a minute amount of the belt body.