Throttle valve device

A throttle valve device comprising:

• a body having a passage and a motor space;
• a valve arranged in the passage of the body and rotatable together with a shaft to open and close the passage;
• a motor held in the motor space of the body and configured to rotate the shaft via a valve gear in response to an electric signal;
• a coil spring arranged in the body between the valve gear and the valve and configured to generate a spring force as an opposing force when rotation is transmitted from the motor to the shaft, the coil spring having first and second spring ends extending outward in a radial direction of the coil spring at opposite ends of the coil spring;
• a first guide covering one end surface of the coil spring and including a first guide hook that contacts the first spring end;
• a body hook provided in the body and capable of contacting a tip end part of the first guide hook by receiving the opposing force of the coil spring;
• and
• a valve gear hook provided in the valve gear and capable of contacting a base end part of the first guide hook to rotate the first guide hook around the shaft against the opposing force of the coil spring, wherein
• the first guide hook has a protrusion protruding toward the first spring end at an intermediate position between the tip end part and the base end part, and
• the first guide hook is deformable toward one of hooks:
• the body hook and the valve gear hook, by receiving the spring force of the coil spring at the protrusion as an effort while a fulcrum is at a contact between the first guide hook and another of the hooks.