A microspectroscope for a two- or three- dimensional mapping measurement comprising: a beam shaping unit for shaping an irradiation light into a linear shape; a movable stage for positioning a sample at a focusing position of the linearly shaped irradiation light; a focusing lens for focusing light from a linear irradiation region formed on the sample; a slit that is provided at an imaging position of the linear irradiation region formed by the focusing lens and is parallel to the longitudinal direction of an image of the linear irradiation region; a spectroscopic unit for receiving a passing light of the slit and dispersing the image of the linear irradiation region in a direction orthogonal to the longitudinal direction of the image; a light detection unit for detecting the dispersed image of the linear irradiation region; and a mapping measurement control unit for performing the mapping measurement by synchronizing the movable stage and the light detection unit, wherein the light detection unit is consisted of a light receiving element group arranged in two directions, the longitudinal direction of the image of the linear irradiation region and a dispersing direction which is orthogonal thereto, characterized in that: the mapping measurement control unit comprises: a continuous scanning control portion for continuously moving the linear irradiation region in a direction orthogonal to the longitudinal direction of the linear irradiation region by the movement of the movable stage without stopping in the sample; a light detection control portion for making the light detection unit to perform a light detection cycle consisting of an exposure period and a read-out period of the light detection unit during the continuous movement of the linear irradiation region and obtaining one average spectrum of a moving range of the linear irradiation region during one light detection cycle; and a mapping data configuration portion for storing the average spectrum per each light detection cycle and configuring mapping data; wherein the light detection control portion is further configured to acquire a spectral image as an average spectrum by a full binning process; and the microspectroscope is further configured to initiate an exposure during the light detection cycle once the moving velocity of the movable stage becomes stable. a beam shaping unit for shaping an irradiation light into a linear shape; a movable stage for positioning a sample at a focusing position of the linearly shaped irradiation light; a focusing lens for focusing light from a linear irradiation region formed on the sample; a slit that is provided at an imaging position of the linear irradiation region formed by the focusing lens and is parallel to the longitudinal direction of an image of the linear irradiation region; a spectroscopic unit for receiving a passing light of the slit and dispersing the image of the linear irradiation region in a direction orthogonal to the longitudinal direction of the image; a light detection unit for detecting the dispersed image of the linear irradiation region; and a mapping measurement control unit for performing the mapping measurement by synchronizing the movable stage and the light detection unit, a continuous scanning control portion for continuously moving the linear irradiation region in a direction orthogonal to the longitudinal direction of the linear irradiation region by the movement of the movable stage without stopping in the sample; a light detection control portion for making the light detection unit to perform a light detection cycle consisting of an exposure period and a read-out period of the light detection unit during the continuous movement of the linear irradiation region and obtaining one average spectrum of a moving range of the linear irradiation region during one light detection cycle; and a mapping data configuration portion for storing the average spectrum per each light detection cycle and configuring mapping data; wherein the light detection control portion is further configured to acquire a spectral image as an average spectrum by a full binning process; and the microspectroscope is further configured to initiate an exposure during the light detection cycle once the moving velocity of the movable stage becomes stable.