Throttle apparatus for an internal combustion engine

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) to control an intake air flow rate of the internal combustion engine, a motor case (110) for containing a motor composing said electric drive actuator (5) and a gear case (102) for containing a gear mechanism (4) to transmit power of said motor to a throttle valve shaft (3) being integrated in a unit, wherein a motor inserting port of said motor case (110) is opened to said gear case (102), said motor being attached to said motor case (110) by fastening a motor bracket (5a) to triangular point arranged screw holes provided a periphery of said motor inserting port with three screws (160) in total, three sides forming a contour of said motor bracket (5a) being curved lines, a motor positioning portion (130, 131, 132) fitting to any of the three curved lines of said motor bracket (5a) to position the motor being formed in said gear case (110).