Patent ID: 8235025

Claim:
A throttle apparatus having a throttle body for supporting a throttle valve for controlling the flow rate of air to flow through an air path, a driving apparatus having an actuator for driving said throttle valve and a transmission mechanism for transmitting a driving force of said actuator to said throttle valve, and a housing in which a ventilation path for communicating an accommodation chamber in which said transmission mechanism is accommodated and an external space with each other is provided, comprising: said housing includes a housing body having a body outer face having an outer face portion to which water in the external space can adhere and in which said ventilation path is provided and a covering wall for cooperating with said housing body to define a covering space having an open port opened to the external space; an outer end opening of said ventilation path opened to the covering space at a lower outer face of the body outer face which faces vertically downwardly; said covering wall covers a covering region, including the entire outer end opening and a peripheral face of the lower outer face around the outer end opening, from vertically downwardly and connects to said housing body on the upstream side with respect to the outer end opening in the covering region in regard to a flow of the adhering water which flows down along the lower outer face; and the open port is opened toward a particular horizontal direction and has an opening area greater than the opening area of the outer end opening within an opening range of the outer end opening in a maximum width direction in which the outer end opening has a maximum opening width as viewed from the particular horizontal direction.