When observing a magnetization image on a magnetic thin film by means of a scanning transmission electron microscope, the effect of a stray magnetic field is made smaller than that of a magnetization in order to produce a clear magnetic structure of the magnetization image. In order to reduce the effect of the stray magnetic field in comparison to that of the magnetization, the invention provides a scanning transmission electron microscope equipped with a specimen-holder driving means which can rotate the surface of a specimen 5 preferably by more than 90 degrees with an axis parallel to the optical path of an electron beam 1 taken as a center and incline the surface of the specimen 5 around a center axis 22 perpendicular to an axis 24 rotated earlier over the surface of the specimen 5 with respect to a magnetic-recording track direction and also perpendicular to the axis parallel to the optical path of the electron beam 1. The invention also provides a magnetic-recording image observing method and an image processing method.