  We present the results of stellar photometry of the polar-ring galaxy NGC 660
using the Hubble Space Telescope's archival data obtained with the Wide Field
Planetary Camera 2. The final list of the resolved stars contains 550 objects,
a considerable part of which are blue and red supergiants belonging to the
polar ring. The analysis of the Colour Magnitude Diagram for polar ring stars
shows that it is best represented by the isochrones with metallicity Z = 0.008.
The process of star formation in the polar ring was continuous and the age of
the youngest detected stars is about 7 Myr.
