In order to provide a charged particle beam apparatus capable of high resolution measurement of a sample at any inclination angle, a charged particle beam apparatus for detecting secondary charged particles (115) generated by irradiating a sample (114) with a primary charged particle beam (110) is provided with a beam tilt lens (113) having: a yoke magnetic path member (132) and a lens coil (134) to focus the primary charged particle beam (110) on the sample (114); and a solenoid coil (133) configured to arrange the upper end on the side surface of the yoke magnetic path member (132) and arrange the bottom end between the tip end of the pole piece of the yoke magnetic path member (132) and the sample (114) in order to arbitrarily tilt the primary charged particle beam (110) on the sample (114).