A test object visualizing device, comprising: a light irradiating unit including a source of light configured to emit light along an optical axis and an optical parametric crystal configured to generate pump light and Stokes light on the same optical axis by light from the source of light and make a wavelength of the pump light and the Stokes light being variable per test position of a test object, the light irradiating unit being configured to irradiate the test object with the pump light and the Stokes light at multiple test positions in at least one direction along the test object, the light irradiating unit further comprising a half mirror; a molecule distribution image generation unit, a tomographic image generation unit, and a signal processing unit, wherein the molecule distribution image generating unit is configured to detect anti-Stokes light emitted from the test object according to a wavelength difference between the pump light and the Stokes light, and wherein the signal processing unit is configured to generate a molecule distribution image based on the anti-Stokes light; and wherein the tomographic image generating unit includes a reflection mirror, and wherein the half mirror is arranged to split both the pump light and the Stokes light in two parts, and the reflection mirror is arranged to reflect one part of the Stokes light and one part of the pump light as Stokes and pump reference light, respectively, and wherein the half mirror and the reflection mirror are configured to generate (i) pump light interference light between the reference light of the pump light with which the test object is irradiated for generation of the molecule distribution image and reflected light, from the test object, of the pump light, and (ii) Stokes light interference light between the reference light of the Stokes light with which the test object is irradiated for generation of the molecule distribution image and reflected light, from the test object, of the Stokes light; and a dichroic mirror configured to split the pump light interference light and the Stokes light interference light from each other; wherein the signal processing unit is configured to generate a tomographic image of the test object based on at least any one of the pump light interference light and the Stokes light interference light; and an image display unit configured to display at least any one of the molecule distribution image and the tomographic image that are generated. a light irradiating unit including a source of light configured to emit light along an optical axis and an optical parametric crystal configured to generate pump light and Stokes light on the same optical axis by light from the source of light and make a wavelength of the pump light and the Stokes light being variable per test position of a test object, the light irradiating unit being configured to irradiate the test object with the pump light and the Stokes light at multiple test positions in at least one direction along the test object, the light irradiating unit further comprising a half mirror; a molecule distribution image generation unit, a tomographic image generation unit, and a signal processing unit, wherein the molecule distribution image generating unit is configured to detect anti-Stokes light emitted from the test object according to a wavelength difference between the pump light and the Stokes light, and wherein the signal processing unit is configured to generate a molecule distribution image based on the anti-Stokes light; and wherein the tomographic image generating unit includes a reflection mirror, and wherein the half mirror is arranged to split both the pump light and the Stokes light in two parts, and the reflection mirror is arranged to reflect one part of the Stokes light and one part of the pump light as Stokes and pump reference light, respectively, and wherein the half mirror and the reflection mirror are configured to generate (i) pump light interference light between the reference light of the pump light with which the test object is irradiated for generation of the molecule distribution image and reflected light, from the test object, of the pump light, and (ii) Stokes light interference light between the reference light of the Stokes light with which the test object is irradiated for generation of the molecule distribution image and reflected light, from the test object, of the Stokes light; and a dichroic mirror configured to split the pump light interference light and the Stokes light interference light from each other; (i) pump light interference light between the reference light of the pump light with which the test object is irradiated for generation of the molecule distribution image and reflected light, from the test object, of the pump light, and (ii) Stokes light interference light between the reference light of the Stokes light with which the test object is irradiated for generation of the molecule distribution image and reflected light, from the test object, of the Stokes light; and a dichroic mirror configured to split the pump light interference light and the Stokes light interference light from each other; wherein the signal processing unit is configured to generate a tomographic image of the test object based on at least any one of the pump light interference light and the Stokes light interference light; and an image display unit configured to display at least any one of the molecule distribution image and the tomographic image that are generated.