A substrate processing apparatus includes: a rotary table provided inside a processing container; a stage provided on an upper surface of the rotary table in order to mount a substrate thereon, and configured to revolve by a rotation of the rotary table; a heater configured to heat the substrate mounted on the stage; and a rotation shaft provided at a location that rotates together with the rotary table to freely rotate while supporting the stage, and including a low heat conductivity body formed of a material with a heat conductivity lower than that of the stage.