An authentication apparatus includes an imaging unit that captures a face image of a user, an authenticating unit that authenticates the user using the face image of the user captured by the imaging unit, a display unit that displays failure information if authentication of the user by the authenticating unit is unsuccessful, a departure detecting unit that detects a departure of the user, and a stopping unit that causes the display unit to stop displaying the failure information if the departure detecting unit detects the departure of the user.