Discussed are a mobile terminal and an operation control method thereof in which a delay time of the screen lock execution is controlled according to the user's gaze information. The mobile terminal according to an embodiment of the present disclosure may include an input unit configured to receive a user input; an execution controller configured to execute screen lock if the user input is not received for a predetermined time T1; and a change controller configured to change the predetermined time T1 based on the user's gaze information.