A torque detecting apparatus comprising: two magnetism collecting rings, configured to concentrate a magnetic flux passing through a magnetic circuit forming member, including: cylindrical portions enclosing the magnetic circuit forming member provided on a rotating body (2, 3) to which torque is exerted; and protruding pieces protruding from parts of the cylindrical portions in an radially outward direction of the cylindrical portions; a circuit board; a magnetism sensitive device, disposed between the protruding pieces, connected to the circuit board via leads, and molded with a portion of the circuit board and the leads by synthetic resin to be a molded part, the torque exerted on the rotating body (2, 3) is detected based on magnetism sensed by the magnetism sensitive device, a regulating body configured to regulate relative locations between the magnetism sensitive device and the respective protruding pieces, characterized in that: the regulating body has two inserting recesses into which the protruding pieces insert respectively, and in that said molded part of the magnetism sensitive device is configured to fit between the inserting recesses. two magnetism collecting rings, configured to concentrate a magnetic flux passing through a magnetic circuit forming member, including: cylindrical portions enclosing the magnetic circuit forming member provided on a rotating body (2, 3) to which torque is exerted; and protruding pieces protruding from parts of the cylindrical portions in an radially outward direction of the cylindrical portions; a circuit board; a magnetism sensitive device, disposed between the protruding pieces, connected to the circuit board via leads, and molded with a portion of the circuit board and the leads by synthetic resin to be a molded part, the torque exerted on the rotating body (2, 3) is detected based on magnetism sensed by the magnetism sensitive device, a regulating body configured to regulate relative locations between the magnetism sensitive device and the respective protruding pieces, characterized in that: the regulating body has two inserting recesses into which the protruding pieces insert respectively, and in that said molded part of the magnetism sensitive device is configured to fit between the inserting recesses. cylindrical portions enclosing the magnetic circuit forming member provided on a rotating body (2, 3) to which torque is exerted; and protruding pieces protruding from parts of the cylindrical portions in an radially outward direction of the cylindrical portions; a circuit board; a magnetism sensitive device, disposed between the protruding pieces, connected to the circuit board via leads, and molded with a portion of the circuit board and the leads by synthetic resin to be a molded part, the torque exerted on the rotating body (2, 3) is detected based on magnetism sensed by the magnetism sensitive device, a regulating body configured to regulate relative locations between the magnetism sensitive device and the respective protruding pieces, characterized in that: the regulating body has two inserting recesses into which the protruding pieces insert respectively, and in that said molded part of the magnetism sensitive device is configured to fit between the inserting recesses. the regulating body has two inserting recesses into which the protruding pieces insert respectively, and in that said molded part of the magnetism sensitive device is configured to fit between the inserting recesses.