<p>A throttle device for an internal combustion engine is provided which comprises an electric drive actuator (5) for opening and closing a throttle valve (2) based on a signal controlling an intake air flow rate of the internal combustion engine. A gap between a throttle valve shaft (3) driven to open and close the throttle valve (2) by said electric drive actuator (5) and a shaft inserting through hole for guiding said throttle valve shaft (3) to a bearing (20) provided in a wall portion of a throttle body (100) is filled with an air leak preventing. <IMAGE></p>
