A spectroscopic analysis device comprising: a light source configured to emit light including a plurality of wavelength components; a polarizer configured to convert the light emitted from the light source to a light of linearly polarized light to be radiated to a sample; a polarizing diffraction element configured to diffract and spectrally disperse a first polarization component included in the light having passed through the sample in a first direction, the polarizing diffraction element being configured to diffract and spectrally disperse a second polarization component included in the light in a second direction different from the first direction; a prism which is disposed on an exit side of the polarizing diffraction element and which has a first exit surface crossing the first direction and a second exit surface crossing the second direction, and in which angles of the first exit surface and the second exit surface with respect to a reference plane including the first direction and the second direction are different; an imaging element configured to capture an image of the first polarization component emitted from the first exit surface of the prism and an image of the second polarization component emitted from the second exit surface; and a processor configured to analyze the sample based on an imaging result of the imaging element, wherein the prism is a member of which a shape in the reference plane is trapezoidal, the first exit surface of the prism is a surface including a first leg of the trapezoid, the second exit surface of the prism is a surface including a second leg of the trapezoid, an angle between the first direction and the first exit surface in the reference plane is set to such an angle that a dispersion angle of the spectrally dispersed first polarization component is expanded, and an angle between the second direction and the second exit surface in the reference plane is set to such an angle that a dispersion angle of the spectrally dispersed second polarization component is expanded. a light source configured to emit light including a plurality of wavelength components; a polarizer configured to convert the light emitted from the light source to a light of linearly polarized light to be radiated to a sample; a polarizing diffraction element configured to diffract and spectrally disperse a first polarization component included in the light having passed through the sample in a first direction, the polarizing diffraction element being configured to diffract and spectrally disperse a second polarization component included in the light in a second direction different from the first direction; a prism which is disposed on an exit side of the polarizing diffraction element and which has a first exit surface crossing the first direction and a second exit surface crossing the second direction, and in which angles of the first exit surface and the second exit surface with respect to a reference plane including the first direction and the second direction are different; an imaging element configured to capture an image of the first polarization component emitted from the first exit surface of the prism and an image of the second polarization component emitted from the second exit surface; and a processor configured to analyze the sample based on an imaging result of the imaging element, wherein the prism is a member of which a shape in the reference plane is trapezoidal, the first exit surface of the prism is a surface including a first leg of the trapezoid, the second exit surface of the prism is a surface including a second leg of the trapezoid, an angle between the first direction and the first exit surface in the reference plane is set to such an angle that a dispersion angle of the spectrally dispersed first polarization component is expanded, and an angle between the second direction and the second exit surface in the reference plane is set to such an angle that a dispersion angle of the spectrally dispersed second polarization component is expanded.