Disclosed herein is a charged particle beam apparatus. The apparatus includes a charged particle beam column irradiating a sample with a charged particle beam, a sample stage unit moving the sample relative to the charged particle beam column, the sample stage unit including a rotary stage section having a base portion and a rotary mover rotating about a rotary axis relative to the base portion, a rotary connector placed coaxially with the rotary axis and fitted between the base portion and the rotary mover, and a first connection electrode disposed on the sample stage unit in electrical connection with the rotary connector. In the charged particle beam apparatus, the sample is able to be rapidly placed and replaced.