To provide a fixing structure for fixing a physical quantity detection part which detects physical quantity regarding rotation to a substratum, and capable of selectively transfer rotation which is an object to be detected to the physical quantity detection part, while alleviating impact from outside to the physical quantity detection part.

A physical quantity detection part fixing structure 100 is for fixing a physical quantity detection part 10 which detects physical quantity regarding rotational movement to a substratum 12. The physical quantity detection part fixing structure 100 includes: an impact absorbing part 14, disposed between the physical quantity detection part 10 and the substratum 12, for absorbing impact energy from the substratum 12 which can bring the translational motion of the physical quantity detection part 10; and a rotational energy transfer part 16 and 18, disposed between the physical quantity detection part 10 and the substratum 12, for transferring rotational energy from the substratum 12, which brings rotational motion of the physical quantity detection part 10, to the physical quantity detection part 10.