NOVELTY - The device (14) has a stroke simulator arranged parallel to a master cylinder and in communication with the cylinder. A component storage box i.e. sensor valve unit, is provided on an attachment body. The box has a component i.e. housing, provided in relation to the cylinder and the stroke simulator. The attachment body has a vent hole with an end in communication with an inner side of the component storage box and another end in communication with an installation space formed before a surface of a dashboard (2) on which the device is mounted.    USE - Input device for mounting on a dashboard of an automatic vehicle brake system in a right-hand drive vehicle or electric vehicle. Can also be used for a left-hand drive vehicle or fuel cell vehicle and a hybrid vehicle.    ADVANTAGE - The input device can be arranged as a separate unit from an electric brake actuator when the input device is incorporated as a component of the vehicle brake system, thus increasing possibility of a layout of the vehicle brake system. The input device can be downsized as the input device is separately placed with respect to the electric brake actuator, thus eliminating the need for ensuring large empty space in an engine room, and hence establishing the vehicle braking system that can be installed in reduced space. The input device has a motor cylinder device remotely arranged from a driver seat as the input device is separately placed with respect to the electric brake actuator, such that a driver can avoid feeling odd or uncomfortable with noise and oscillations arising from the motor cylinder device when the motor cylinder device is a source of noise and oscillations. The end of the vent hole serving as an aperture of the box is in communication with the space formed before the surface of the dashboard and covered with the dashboard to prevent intrusion of foreign matter and water through the vent hole into the box, thus improving reliability in behavior of the component stored inside the box. The input device has a lightening portion formed in consideration of shrinkage and running of molten metal, while avoiding the need to perform separate machining process, thus improving production efficiency of the input device.    DESCRIPTION OF DRAWING(S) - The drawing shows a rear sectional view of a vehicle brake system including an input device.    Vehicle (V)    Dashboard (2)    Vehicle brake system (10)    Input device (14)    Motor cylinder device (16)