To provide a static pressure gas bearing spindle capable of effectively reducing heat generation or heat transmission.

The static pressure gas bearing spindle A includes: a static pressure gas bearing 3 rotatably supporting a main shaft 1; and a motor 6 constituted by fixing a motor rotor 8 to the main shaft 1 to rotationally drive the main shaft 1. One end of the main shaft 1 is a rotated body setting part 1a for mounting the rotated body. As a material of the rotated body setting part 1a, zirconia ceramic lower in thermal conductivity than a main shaft body 1b excluding the rotated body setting part 1a of the main shaft 1 is used.