Provided is an oscillator provided with a function enabling high frequency oscillation, a high Q value, and high heat stability through the use of a magnetic-vortex structure and interlayer exchange coupling. The present invention is provided with: a fixed layer (11) comprising a magnetic body of fixed magnetization having a magnetic-vortex structure vertically magnetized in the center portion
a non-magnetic layer (12) comprising a non-magnetic body laminated on the fixed layer (11)
a free layer (13) laminated on the nonmagnetic layer (12) and having vertical magnetization rotatably moving in the planar direction, the free layer (13) comprising a strongly magnetic body having a magnetic-vortex structure of circular or regularly polygonal planar configuration that is vertically magnetized in the center portion
and a current-supply unit (16) for sending a current through the layers. The oscillator oscillates using the relative difference in angle between the magnetization in the fixed layer (11) and the central magnetization of the free layer (13). The free layer (13) is composed of a plurality of strongly magnetic free layers coupled using interlayer exchange coupling.