An emergency button for a vehicle used for emergency rescue when a vehicle accident or an emergency situation occurs has a design structure reflecting a design to prevent an erroneous operation for conforming to governmental regulations, and an intuitive human-machine interface (HMI) to allow a user to easily operate the emergency button and prevent an erroneous operation from being generated. The emergency button includes a case; a cap coupled to an upper portion of the case so as to move up and down during rotation; and a button part which is interfered in a rotation direction and slidably coupled with the cap to be rotated together with the cap, receives elastic support by a spring at a lower side to be movable up and down, and is in contact with the switch for transmitting a call connection signal within the case to transmit a call connection signal.