Rotation angle sensor provided with pedestal and rotary machine

A rotary machine which is provided with a rotation angle sensor which detects a rotation angle of a shaft of a motor or a shaft of a machine which is driven by a motor, said rotation angle sensor comprising;

• a rotary body which rotates attached to said shaft and is provided with a detected part at its outer circumferential part;
• a detection element which is set on a line which perpendicularly intersects an axial line of said shaft and faces said detected part;
• and
• a pedestal which is provided at its center part with an opening part through which said shaft is inserted and which attaches said detection element, wherein
• said pedestal is formed as a pedestal which is provided with a recessed part to which said detection element is attached,
• around said recessed part, an abutting surface which abuts against an end face of said detection element at a far side from said shaft is formed, and
• said abutting surface is formed so that a distance from an axial line of said shaft changes along a peripheral direction of said pedestal.