Throttle valve device

The invention provides a throttle device which can realize improvement of formability, low cost, improvement of degree of freedom in assembly, miniaturization and the like, and can detect the temperature of intake air with high precision. This throttle device is provided with: a throttle body (10) having a main passage (12) through which intake air passes, a mounting surface (16) formed on the outer wall, and a communication passage (17) that opens to the mounting surface and communicates with the main passage; a throttle valve (30) that opens and closes the main passage; and a sensor unit (U) joined to the mounting surface, the sensor unit (U) comprising: a housing (60) having a joining surface (61) joined to the mounting surface and a sensor housing recess (62) recessed from the joining surface and communicating with the communication path; a circuit board (70) embedded in the housing; and a temperature sensor (80) electrically connected to the circuit board and disposed so as to protrude within the sensor