Patent ID: 8314940

Claim:
A probe microscope for scanning a surface of a measurement target object to observe a surface shape of the measurement target object, comprising: a cantilever that includes a probe that can be brought into contact with the measurement target object; a first displacement detection optical system that detects displacement of the cantilever, the first displacement detection optical system including: a first light source that irradiates the cantilever with light, and a first displacement detecting section that detects the displacement of the cantilever by receiving light emitted from the first light source and reflected by the cantilever thereafter; a second displacement detection optical system that detects displacement of the measurement target object, the second displacement detection optical system including: a second light source that irradiates the measurement target object with light that has a second wavelength that is different from a first wavelength of the light emitted from the first light source, and a second displacement detecting section that detects the displacement of the measurement target object by receiving light emitted from the second light source and reflected by the measurement target object thereafter; and an object lens that is provided at a position between the cantilever and the first light source and between the cantilever and the second light source, the object lens having a focal position for the light that is emitted from the first light source and has the first wavelength at the position of the cantilever and has a focal position for the light that is emitted from the second light source and has the second wavelength at the position of the measurement target object.